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
The core of sulfur springs — softens keratin and supports antiseptic, anti-inflammatory action.
The gaseous form found in sulfur springs; works with sulfide ions to soften keratin and calm inflammation.
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.
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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.
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References
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