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Hot Springs for Atopic Dermatitis | Sulfur & Acidic Springs: Benefits and Precautions

Published May 6, 2026·1min read

Sulfur springs and acidic springs are officially indicated for atopic dermatitis and psoriasis in Japan's Ministry of the Environment guidelines. However, their strong stimulating properties can worsen symptoms in some cases — consulting a dermatologist and post-bath moisturising are essential.

Hot Springs for Atopic Dermatitis | Sulfur & Acidic Springs: Benefits and Precautions
Applicable spring types
2 types
Analysis records
26 records
Table of Contents
  1. 2 Spring Types Indicated for Chronic Skin Conditions
  2. Onsen minerals involved in atopic dermatitis
  3. How hot springs help atopic dermatitis
  4. Bathing precautions for sensitive skin

2 Spring Types Indicated for Chronic Skin Conditions

Japan's Ministry of the Environment lists two spring types with bathing indications for atopic dermatitis and psoriasis:

Soften the stratum corneum and offer antiseptic/anti-inflammatory action. Hydrogen sulfide and sulfur-ion types act differently on the skin.

Strong bactericidal action; effective for chronic skin conditions. Strongly acidic springs (pH ≤ 3, e.g. Kusatsu Onsen) have especially high antiseptic potency.

Onsen minerals involved in atopic dermatitis

Sulfide ionRead the mineral guide

The core of sulfur springs — softens keratin and supports antiseptic, anti-inflammatory action.

Free hydrogen sulfideRead the mineral guide

The gaseous form found in sulfur springs; works with sulfide ions to soften keratin and calm inflammation.

Aluminum ionRead the mineral guide

Abundant in acidic springs, providing astringent, antibacterial tightening of the skin.

How hot springs help atopic dermatitis

The hydrogen sulfide in sulfur springs softens surface keratin and is thought to curb bacteria such as Staphylococcus aureus, with antiseptic and anti-inflammatory effects. Acidic springs use hydrogen ions (H⁺) for strong bactericidal action that helps rebalance the skin flora and reduce the microbes driving chronic inflammation. Because both are highly stimulating, start with short soaks during remission, when the skin barrier is intact.

Filter on the map & mineral viewer

Filter by the relevant spring types and find onsen you like from the map or list. Compare analysis details with the mineral viewer.

Find onsen by these spring types

Bathing precautions for sensitive skin

  • Avoid bathing during acute flare-ups or when skin is broken or oozingBathing in mineral-rich onsen water can be overly stimulating for compromised skin. During an acute phase, when the skin barrier is already weakened by wounds or inflammation, exposure to these minerals can worsen symptoms and cause further irritation.
  • Start with short soaks (5–10 min) or partial immersion to gauge skin responseSince onsen water, especially therapeutic types like sulfur and acid springs, can be stimulating, it is wise to test your skin's tolerance. Begin with a brief 5 to 10-minute soak or by only immersing parts of your body to see how your skin reacts before committing to a full bath.
  • Rinse with lukewarm fresh water after bathing to remove spring residueThe same mineral components that provide therapeutic effects during your soak can irritate sensitive skin if left on for an extended period. A thorough rinse with fresh, lukewarm water helps remove any lingering residue, preventing potential post-bath dryness or irritation.
  • Apply moisturiser immediately after drying to support the skin barrierHot water and certain spring minerals can strip the skin of its natural oils, weakening its protective barrier. Applying a moisturizer immediately after gently patting your skin dry helps to lock in hydration and restore this barrier function, which is crucial for managing sensitive skin.
  • Stop bathing if itching or irritation increasesAn increase in itching, redness, or general irritation is a clear signal that the onsen water is too strong for your skin's current condition. Discontinue the bath immediately to prevent your symptoms from worsening and avoid further aggravating your skin.

Related Onsen Facilities

19 matches
Oyado Konoha Sulphur Spring
Sulphur SpringAcidic SpringChloride SpringSulphate SpringInfo pending
Oyado Konoha
木の葉
Gunma Kusatsu· わたの湯1Kusatsu Onsen
The Cotton-Wrapped Spring

This rare, naturally gushing source emerges from beneath 'Gensenkaku,' nestled beside Kusatsu Onsen's iconic Yubatake (Kusatsu's central hot-water field). Despite its strong acidity, its waters offer a remarkably soft bathing sensation, akin to being enveloped in silk floss. The milky-white waters, renowned for having Kusatsu's finest 'yunohana' (hot spring minerals), gently embrace the skin, contributing to silky skin and providing a restorative warmth that lingers deep within the body. Known as a 'phantom spring' for its history of disappearing once during the Taisho era, it now offers a profound escape from daily life, inviting deep relaxation and rejuvenation.

Onsen RyokanPrivate Rental Bath
StimulationBactericidalSkin BeautyHeat RetentionRelaxation
pHStrongly Acidic2.1
0714
TEMP50.2
0℃50℃100℃
KEY MINERALS
44.3 mg/kg

Strong astringent action that tightens skin. A key component of acidic springs, suited to oily or acne-prone skin.

The source of the distinctive sulfur smell. Dilates blood vessels via skin and inhalation to strongly boost circulation.

9.6 mg/kg

Mild antibacterial action keeps the skin clean. Trace transdermal absorption supports tooth and bone health.

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Ukihabekkan Shinshiyou Sulphur Spring
Sulphur SpringSimple SpringVerified
Ukihabekkan Shinshiyou
浮羽別館 新紫陽
Oita Hita· 浮羽別館・新紫陽
Bungo's Silken Retreat

Amagase Onsen is one of Bungo's three great hot springs, alongside Beppu and Yufuin. The Ukihabekan Shinshiyo source is drawn via a 150-meter deep powered drill from a hillside site. With over 1,300 years of history, Amagase's waters were mentioned in the ancient "Bungo Fudoki" chronicles and have long been cherished for therapeutic bathing. This source combines pH 8.9 alkalinity with sulfur properties, gently removing old skin cells for a smooth feel. You can enjoy a silky skin sensation after bathing, perfect for those seeking to refresh mind and body.

Onsen RyokanPrivate Rental BathRoom with Open-air Bath
StimulationBactericidalSkin BeautyHeat RetentionRelaxation
pHMildly Alkaline8.9
0714
TEMP79.7
0℃50℃100℃
KEY MINERALS

A natural moisturizer also used in skincare lotions. Forms a thin veil on the skin to reduce moisture loss after bathing.

5.8 mg/kg

A trace antibacterial component that keeps skin clean.

12.2 mg/kg

A trace component with gentle antibacterial and anti-inflammatory action.

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Kurama Onsen Sulphur Spring
Sulphur SpringInfo pending
Kurama Onsen
くらま温泉
Kyoto Sakyo-ku, Kyoto· くらま温泉源泉 No.2
The Skin-Beautifying Spring of Kyoto's Mountains

Emerging from a tea field near the gate of Kurama-dera Temple in Kyoto's "inner parlor" during the late Meiji era, this rare and esteemed hot spring offers subtly sulfur-scented waters. Its gentle, weak alkaline touch smoothly envelops the skin, leaving it with a silky feel. After bathing, a refreshing lightness of body and mind promotes rejuvenation. It provides deep relaxation, helping to relieve pain from journeys exploring Kifune Shrine and Kurama-dera Temple, allowing visitors to deeply refresh amidst the beauty of nature through the four seasons.

Onsen RyokanTattoo OK (public bath)
StimulationBactericidalSkin BeautyHeat RetentionRelaxation
pHMildly Alkaline7.8
0714
TEMP14.4
0℃50℃100℃
KEY MINERALS

Softens dead skin cells for a silky bathing feel.

The aroma typical of sulfur springs, with circulatory and antibacterial effects.

A natural moisturizer that leaves a hydrated feel on the skin.

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Noboribetsu Onsen Manseikaku Ferruginous Spring
Ferruginous SpringSulphur SpringAcidic SpringSimple SpringInfo pending
Noboribetsu Onsen Manseikaku
登別温泉 万世閣
Hokkaido Noboribetsu· 登別温泉 1号乙泉Noboribetsu Onsen
Hot Spring Department Store

Noboribetsu Onsen, Hokkaido's renowned hot spring, often called a 'department store of hot springs,' began its formal history in the Edo period when Takimoto Kinzo established a therapeutic bath. Despite the rugged landscape of 'Jigokudani' (Hell Valley), an explosive crater site said to be home to demons, the waters, a bounty from this earth, are filled with powerful healing. This acidic, sulfur-scented spring water thoroughly cleanses the skin and delivers restorative warmth deep into the body. It is highly recommended for those who wish to feel the energy of nature and experience a dynamic rejuvenation of mind and body.

Onsen RyokanRoom with Open-air Bath
StimulationBactericidalSkin BeautyHeat RetentionRelaxation
pHStrongly Acidic2.3
0714
TEMP72.5
0℃50℃100℃
KEY MINERALS
29.1 mg/kg

Strong astringent action that tightens skin. A key component of acidic springs, suited to oily or acne-prone skin.

The source of the distinctive sulfur smell. Dilates blood vessels via skin and inhalation to strongly boost circulation.

21.3 mg/kg

A trace component with gentle antibacterial and anti-inflammatory action.

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Noboribetsu Onsen Sulphur Spring
Sulphur SpringChloride SpringCarbonated SpringFerruginous SpringAcidic SpringSimple SpringInfo pending
Noboribetsu Onsen
滝乃家
Hokkaido Noboribetsu· うまの湯3Noboribetsu Onsen
Historic Noboribetsu Healing Waters

Nestled in Noboribetsu Onsen, famously called the "Department Store of Hot Springs" and rooted in the Ainu "Nupur-pet" (deeply colored river), the historic "Uma no Yu" source has flowed since Taisho 6 (1917). Its faint sulfur aroma gently unwinds the mind and body. The waters, softly enveloping the skin, warm the body to its core, providing restorative warmth that lingers. Overlooking a beautiful Japanese garden, this tranquil spring offers deep relaxation, a serene escape from daily commotion.

Onsen RyokanRoom with Open-air Bath
StimulationBactericidalSkin BeautyHeat RetentionRelaxation
pHNeutral6.4
0714
TEMP62.3
0℃50℃100℃
KEY MINERALS

The source of the distinctive sulfur smell. Dilates blood vessels via skin and inhalation to strongly boost circulation.

28.0 mg/kg

A trace component with gentle antibacterial and anti-inflammatory action.

A natural moisturizer also used in skincare lotions. Forms a thin veil on the skin to reduce moisture loss after bathing.

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Kusatsuonsen Tenojiya Sulphur Spring
Sulphur SpringAcidic SpringChloride SpringSulphate SpringInfo pending
Kusatsuonsen Tenojiya
草津温泉 ての字屋
Gunma Kusatsu· 宝泉の湯1
The Rock-Born Treasure Spring

Housen-no-Yu, a precious spring at Kusatsu Onsen, one of Japan's three most famous hot springs, has naturally gushed from bedrock for approximately 1200 years. Distinct from major sources like Yubatake and Bandaiko, this rare water gently envelops the skin with its sulfurous aroma. Its crisp quality offers a sensation of purifying both mind and body. After bathing, your skin will feel wonderfully silky, and the restorative warmth from deep within will invite deep relaxation, supporting overall rejuvenation. It is highly recommended for those seeking to escape daily life and reset themselves with a truly special hot spring experience.

Onsen RyokanRoom with Open-air Bath
StimulationBactericidalSkin BeautyHeat RetentionRelaxation
pHStrongly Acidic2
0714
TEMP45
0℃50℃100℃
KEY MINERALS
43.3 mg/kg

Strong astringent action that tightens skin. A key component of acidic springs, suited to oily or acne-prone skin.

The source of the distinctive sulfur smell. Dilates blood vessels via skin and inhalation to strongly boost circulation.

8.4 mg/kg

Mild antibacterial action keeps the skin clean. Trace transdermal absorption supports tooth and bone health.

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Bourou NOGUCHI Noboribetsu Sulphur Spring
Sulphur SpringChloride SpringSulphate SpringInfo pending
Bourou NOGUCHI Noboribetsu
望楼NOGUCHI登別
Hokkaido Noboribetsu City· 奥の湯Noboribetsu Onsen
Sophisticated Adult Retreat

A new 'Wa-modern' current emerged in Noboribetsu Onsen's history in 2006. This distinctive spring, with its faintly fragrant sulfur, evokes a sense of travel, while its chloride and sulfate composition gently infuses the skin with rich warmth. The heat gradually permeates the body's core, offering a pleasant restorative warmth that endures post-bath. It is perfectly suited for those desiring deep relaxation for mind and body in a sophisticated ambiance, far from daily clamor.

Onsen RyokanPrivate Rental BathRoom with Open-air Bath
StimulationBactericidalSkin BeautyHeat RetentionRelaxation
pHAcidic5.7
0714
TEMP46.1
0℃50℃100℃
KEY MINERALS
64.1 mg/kg

Undissociated boric acid with antibacterial action that keeps the skin surface clean.

The source of the distinctive sulfur smell. Dilates blood vessels via skin and inhalation to strongly boost circulation.

A natural moisturizer also used in skincare lotions. Forms a thin veil on the skin to reduce moisture loss after bathing.

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Yuyado Tokinoniwa Sulphur Spring
Sulphur SpringAcidic SpringChloride SpringSulphate SpringVerified
Yuyado Tokinoniwa
湯宿 季の庭
Gunma Kusatsu· わたの湯1Kusatsu Onsen
The Cotton-Wrapped Spring

This rare, naturally gushing source emerges from beneath 'Gensenkaku,' nestled beside Kusatsu Onsen's iconic Yubatake (Kusatsu's central hot-water field). Despite its strong acidity, its waters offer a remarkably soft bathing sensation, akin to being enveloped in silk floss. The milky-white waters, renowned for having Kusatsu's finest 'yunohana' (hot spring minerals), gently embrace the skin, contributing to silky skin and providing a restorative warmth that lingers deep within the body. Known as a 'phantom spring' for its history of disappearing once during the Taisho era, it now offers a profound escape from daily life, inviting deep relaxation and rejuvenation.

Onsen RyokanPrivate Rental BathRoom with Open-air Bath
StimulationBactericidalSkin BeautyHeat RetentionRelaxation
pHStrongly Acidic2.1
0714
TEMP50.2
0℃50℃100℃
KEY MINERALS
44.3 mg/kg

Strong astringent action that tightens skin. A key component of acidic springs, suited to oily or acne-prone skin.

The source of the distinctive sulfur smell. Dilates blood vessels via skin and inhalation to strongly boost circulation.

9.6 mg/kg

Mild antibacterial action keeps the skin clean. Trace transdermal absorption supports tooth and bone health.

Check Availability & Rates
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Kusatsu Kan Sulphur Spring
Sulphur SpringAcidic SpringChloride SpringSulphate SpringInfo pending
Kusatsu Kan
草津館
Gunma Kusatsu, Agatsuma District· 白旗源泉1Kusatsu Onsen
Shirahata-no-yu of Kusatsu

Shirahatage Genzen, located in Kusatsu Onsen and adjacent to Yubatake (Kusatsu's central hot-water field), is said to have been discovered by Minamoto no Yoritomo. Historically, it served as the stage for 'Jikan-yu' (timed bathing), supporting balneotherapy culture, and is truly considered the soul of Kusatsu. Its distinctive aroma and powerful waters, which feel as though they firm the skin, seem to awaken the mind and body from within. Surrendering to its embrace offers a pure moment to shed daily clamor and rediscover one's true self. This spring is a sanctuary for those seeking a fresh start and rejuvenation.

Onsen Ryokan
StimulationBactericidalSkin BeautyHeat RetentionRelaxation
pHStrongly Acidic2
0714
TEMP51.9
0℃50℃100℃
KEY MINERALS
47.1 mg/kg

Strong astringent action that tightens skin. A key component of acidic springs, suited to oily or acne-prone skin.

The source of the distinctive sulfur smell. Dilates blood vessels via skin and inhalation to strongly boost circulation.

10.0 mg/kg

Mild antibacterial action keeps the skin clean. Trace transdermal absorption supports tooth and bone health.

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Tajimayaryokan Sulphur Spring
Sulphur SpringAcidic SpringChloride SpringSulphate SpringInfo pending
Tajimayaryokan
草津温泉 田島屋旅館
Gunma Kusatsu· 湯畑源泉Kusatsu Onsen
The Cure-All Spring

The Yubatake source, naturally gushing from Kusatsu Onsen's iconic Yubatake (Kusatsu's central hot-water field), holds a distinguished history. During the Edo period, it was ranked as the highest-ranking Ozeki in the Onsen Banzuke, recognized alongside the Shirahata source as one of Kusatsu's two major hot springs. Its powerful, pH2 water, permeated with a sulfurous aroma, imparts a refreshing, tightening sensation upon the skin. A soak in this historic, renowned hot spring cleanses the body and mind, offering deep relaxation and rejuvenation from daily fatigue. It is a must-visit for those seeking to feel the energy of a historic hot spring and desire a complete refresh.

Onsen Ryokan
StimulationBactericidalSkin BeautyHeat RetentionRelaxation
pHStrongly Acidic2
0714
TEMP52.3
0℃50℃100℃
KEY MINERALS
49.1 mg/kg

Strong astringent action that tightens skin. A key component of acidic springs, suited to oily or acne-prone skin.

The source of the distinctive sulfur smell. Dilates blood vessels via skin and inhalation to strongly boost circulation.

10.1 mg/kg

Mild antibacterial action keeps the skin clean. Trace transdermal absorption supports tooth and bone health.

Check Availability & Rates
PRIncludes affiliate links
Kamenoihoteru Kusatsurizoto Acidic Spring
Acidic SpringChloride SpringSulphate SpringInfo pending
Kamenoihoteru Kusatsurizoto
草津温泉ホテルリゾート
Gunma Kusatsu· 万代鉱Kusatsu Onsen
Scalding Strong Acidic Spring

The Mandaiko source, originating from traces of past mining development, is deeply intertwined with Kusatsu Onsen's unique yumomi culture and its long history of toji (therapeutic bathing). Its highly acidic waters, among Japan's most potent, deliver a distinctive tingling sensation, awakening both mind and body and offering a sense of rejuvenation. The high-temperature blessings penetrate deep into the core, leaving you with a surprisingly light and refreshed feeling after your bath. We invite those seeking a genuine toji experience, a true escape from daily life to restore their mind and body, to discover the profound power of this spring.

Onsen Ryokan
StimulationBactericidalSkin BeautyHeat RetentionRelaxation
pHStrongly Acidic1.75
0714
TEMP94.6
0℃50℃100℃
KEY MINERALS
43.2 mg/kg

Strong astringent action that tightens skin. A key component of acidic springs, suited to oily or acne-prone skin.

25.1 mg/kg

Mild antibacterial action keeps the skin clean. Trace transdermal absorption supports tooth and bone health.

A natural moisturizer also used in skincare lotions. Forms a thin veil on the skin to reduce moisture loss after bathing.

Check Availability & Rates
PRIncludes affiliate links
Noboribetsu Onsen Chloride Spring
Chloride SpringFerruginous SpringAcidic SpringSulphur SpringSulphate SpringInfo pending
Noboribetsu Onsen
ホテルまほろば
Hokkaido Noboribetsu· 登別温泉5号泉3Noboribetsu Onsen
Earth's Bounty Salt Waters

Originating from the dramatic Jigokudani (Hell Valley), the potent waters of Noboribetsu Onsen, a renowned hot spring resort in Hokkaido, have long welcomed those seeking therapeutic benefits. This powerful spring gently envelops the skin, delivering restorative warmth that penetrates deep into the body's core. The comforting heat lingers long after bathing, promoting deep relaxation and offering respite from the stresses of daily life. It is highly recommended for individuals desiring an authentic balneotherapy experience in Japan's northern frontier.

Onsen RyokanRoom with Open-air Bath
StimulationBactericidalSkin BeautyHeat RetentionRelaxation
pHNeutral6.7
0714
TEMP94.9
0℃50℃100℃
KEY MINERALS

Undissociated boric acid with antibacterial action that keeps the skin surface clean.

A natural moisturizer also used in skincare lotions. Forms a thin veil on the skin to reduce moisture loss after bathing.

4894 mg/kg

Boosts after-bath warmth and warms the body from the core.

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Kusatsuonsen Ichii Acidic Spring
Acidic SpringChloride SpringSulphate SpringSulphur SpringInfo pending
Kusatsuonsen Ichii
ホテル一井
Gunma Kusatsu· 万代鉱1Kusatsu Onsen
The Strongest Spring from the Mine

The Bandaiko source, which unexpectedly erupted from within the Bandai Sulfur Mine in 1970, now stands as Kusatsu's primary hot spring, boasting the largest output and supporting the town. Named with the wish for 'eternal prosperity' (万代), this powerful source was born in the mountains, far from the Yubatake (Kusatsu's central hot-water field). Its colorless, transparent waters deliver a stimulating tingle that awakens both mind and body, while its robust warmth permeates to the very core. This energetic spring is a perfect companion for those seeking liberation from daily routines and a crisp mental and physical rejuvenation.

Onsen Ryokan
StimulationBactericidalSkin BeautyHeat RetentionRelaxation
pHStrongly Acidic1.7
0714
TEMP94.6
0℃50℃100℃
KEY MINERALS
43.2 mg/kg

Strong astringent action that tightens skin. A key component of acidic springs, suited to oily or acne-prone skin.

25.1 mg/kg

Mild antibacterial action keeps the skin clean. Trace transdermal absorption supports tooth and bone health.

A natural moisturizer also used in skincare lotions. Forms a thin veil on the skin to reduce moisture loss after bathing.

Check Availability & Rates
PRIncludes affiliate links
Gouraonsen Kiritani Hakonesou Acidic Spring
Acidic SpringSulphate SpringChloride SpringVerified
Gouraonsen Kiritani Hakonesou
桐谷 箱根荘
Kanagawa Hakone· 大涌谷温泉 (2号・3号線混合泉)Hakone Onsen
The Turbid Water of the Earth's Pulse

This unique created hot spring utilizes the fumaroles of Owakudani, which were formed by volcanic activity approximately 3000 years ago. In the early Showa period, Hakone Onsen Kyokyu Co., Ltd. developed this source to supply hot water to areas like Sengokuhara and Gora. The water, created by mixing volcanic gas and water, offers a distinct, tingling, and tightening sensation upon contact with the skin. The powerful energy from the earth delivers restorative warmth deep into the body, a warmth that lingers long after your bath. It is ideal for those seeking deep relaxation and rejuvenation, wishing to refresh their mind and body.

Onsen RyokanPrivate Rental BathRoom with Open-air Bath
StimulationBactericidalSkin BeautyHeat RetentionRelaxation
pHStrongly Acidic2.1
0714
TEMP60.6
0℃50℃100℃
KEY MINERALS
7.5 mg/kg

Tightens the skin and balances sebum.

A natural moisturizer also used in skincare lotions. Forms a thin veil on the skin to reduce moisture loss after bathing.

14.2 mg/kg

A trace component with gentle antibacterial and anti-inflammatory action.

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Kusatsuonsen Bouun Acidic Spring
Acidic SpringChloride SpringSulphate SpringVerified
Kusatsuonsen Bouun
望雲
Gunma Kusatsu· 万代鉱1Kusatsu Onsen
Scalding Strong Acidic Spring

The Mandaiko source, originating from traces of past mining development, is deeply intertwined with Kusatsu Onsen's unique yumomi culture and its long history of toji (therapeutic bathing). Its highly acidic waters, among Japan's most potent, deliver a distinctive tingling sensation, awakening both mind and body and offering a sense of rejuvenation. The high-temperature blessings penetrate deep into the core, leaving you with a surprisingly light and refreshed feeling after your bath. We invite those seeking a genuine toji experience, a true escape from daily life to restore their mind and body, to discover the profound power of this spring.

Onsen Ryokan
StimulationBactericidalSkin BeautyHeat RetentionRelaxation
pHStrongly Acidic1.75
0714
TEMP94.6
0℃50℃100℃
KEY MINERALS
43.2 mg/kg

Strong astringent action that tightens skin. A key component of acidic springs, suited to oily or acne-prone skin.

25.1 mg/kg

Mild antibacterial action keeps the skin clean. Trace transdermal absorption supports tooth and bone health.

A natural moisturizer also used in skincare lotions. Forms a thin veil on the skin to reduce moisture loss after bathing.

Check Availability & Rates
PRIncludes affiliate links
Sengokuharaonsen Senkyourou Acidic Spring
Acidic SpringSulphate SpringChloride SpringVerified
Sengokuharaonsen Senkyourou
仙郷楼
Kanagawa Hakone· 大涌谷温泉 蒸気造成混合泉
Owakudani's Earthly Pulse

Originating from the fumaroles of Owakudani, born from the eruption of Hakone volcano approximately 3,000 years ago, this artificially developed hot spring began to be supplied to Sengokuhara and Gora by Hakone Onsen Kyokyu Co., Ltd. in Showa 5 (1930). Its renowned milky white waters, blended with naturally gushing spring water, offer a pleasant sensation that tightens the skin and a powerful restorative warmth that penetrates deep into the body's core. After bathing, you'll feel surprisingly refreshed and light. It's a perfect companion when you seek to feel the Earth's energy and achieve deep relaxation and rejuvenation for your mind and body.

Onsen RyokanPrivate Rental BathRoom with Open-air Bath
StimulationBactericidalSkin BeautyHeat RetentionRelaxation
pHStrongly Acidic2.1
0714
TEMP60.6
0℃50℃100℃
KEY MINERALS
7.5 mg/kg

Tightens the skin and balances sebum.

A natural moisturizer also used in skincare lotions. Forms a thin veil on the skin to reduce moisture loss after bathing.

14.2 mg/kg

A trace component with gentle antibacterial and anti-inflammatory action.

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Rabisuta Kusatsuhiruzu Acidic Spring
Acidic SpringChloride SpringSulphate SpringSulphur SpringInfo pending
Rabisuta Kusatsuhiruzu
ラビスタ草津ヒルズ(共立リゾート)
Gunma Kusatsu· 万代鉱2
Scalding Strong Acidic Spring

The Mandaiko source, originating from traces of past mining development, is deeply intertwined with Kusatsu Onsen's unique yumomi culture and its long history of toji (therapeutic bathing). Its highly acidic waters, among Japan's most potent, deliver a distinctive tingling sensation, awakening both mind and body and offering a sense of rejuvenation. The high-temperature blessings penetrate deep into the core, leaving you with a surprisingly light and refreshed feeling after your bath. We invite those seeking a genuine toji experience, a true escape from daily life to restore their mind and body, to discover the profound power of this spring.

Onsen RyokanPrivate Rental BathRoom with Open-air Bath
StimulationBactericidalSkin BeautyHeat RetentionRelaxation
pHStrongly Acidic1.75
0714
TEMP94.6
0℃50℃100℃
KEY MINERALS
43.2 mg/kg

Strong astringent action that tightens skin. A key component of acidic springs, suited to oily or acne-prone skin.

25.1 mg/kg

Mild antibacterial action keeps the skin clean. Trace transdermal absorption supports tooth and bone health.

A natural moisturizer also used in skincare lotions. Forms a thin veil on the skin to reduce moisture loss after bathing.

Check Availability & Rates
PRIncludes affiliate links
Noboribetsu Onsen Acidic Spring
Acidic SpringFerruginous SpringSulphate SpringChloride SpringCarbonated SpringSulphur SpringSimple SpringVerified
Noboribetsu Onsen
第一滝本館大浴場
Hokkaido Noboribetsu· 1号甲泉2Noboribetsu Onsen
Blessings of the Earth, Powerful Acidic Spring

This is one of the most well-known sources in Noboribetsu, a leading onsen destination in Hokkaido. It continuously flows at a high temperature of 96.5°C, embodying the raw power of the earth. The highly acidic water, with a pH of 2.2, provides a tingling sensation on the skin and a refreshing feeling after bathing. Its rich iron and sulfate content offers a powerful bathing experience that feels as if it's awakening both mind and body. It's a spring for those who wish to reset from daily fatigue, gain new vitality, and feel nature's energy throughout their entire being.

Onsen RyokanRoom with Open-air BathTattoo OK (public bath)
StimulationBactericidalSkin BeautyHeat RetentionRelaxation
pHStrongly Acidic2.2
0714
TEMP96.5
0℃50℃100℃
KEY MINERALS

Undissociated boric acid with antibacterial action that keeps the skin surface clean.

16.9 mg/kg

Strong astringent action that tightens skin. A key component of acidic springs, suited to oily or acne-prone skin.

A natural moisturizer also used in skincare lotions. Forms a thin veil on the skin to reduce moisture loss after bathing.

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Kusatsuonsen Sen Acidic Spring
Acidic SpringChloride SpringSulphate SpringInfo pending
Kusatsuonsen Sen
草津温泉 千
Gunma Kusatsu· 万代鉱Kusatsu Onsen
Scalding Strong Acidic Spring

The Mandaiko source, originating from traces of past mining development, is deeply intertwined with Kusatsu Onsen's unique yumomi culture and its long history of toji (therapeutic bathing). Its highly acidic waters, among Japan's most potent, deliver a distinctive tingling sensation, awakening both mind and body and offering a sense of rejuvenation. The high-temperature blessings penetrate deep into the core, leaving you with a surprisingly light and refreshed feeling after your bath. We invite those seeking a genuine toji experience, a true escape from daily life to restore their mind and body, to discover the profound power of this spring.

Onsen RyokanPrivate Rental BathTattoo OK (public bath)
StimulationBactericidalSkin BeautyHeat RetentionRelaxation
pHStrongly Acidic1.75
0714
TEMP94.6
0℃50℃100℃
KEY MINERALS
43.2 mg/kg

Strong astringent action that tightens skin. A key component of acidic springs, suited to oily or acne-prone skin.

25.1 mg/kg

Mild antibacterial action keeps the skin clean. Trace transdermal absorption supports tooth and bone health.

A natural moisturizer also used in skincare lotions. Forms a thin veil on the skin to reduce moisture loss after bathing.

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