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Skin Infections (Pyoderma) & Onsen | Strong Antimicrobial Action of Acidic and Sulfur Springs

Published May 6, 2026·1min read

Epidermal pyoderma (bacterial skin infections) is officially listed as a bathing indication for both acidic and sulfur springs. Both spring types have strong antimicrobial properties that suppress pathogenic bacteria such as Staphylococcus aureus. However, active infection with exudate is a contraindication.

Applicable spring types
2 types
Analysis records
10 records

Pyoderma includes folliculitis, furuncles, and impetigo. Acidic springs (low pH) inhibit bacterial growth through acidity; sulfur springs supply H₂S which directly eliminates bacteria. These springs have historically been called "skin disease springs" in Japan for this reason.

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Acidic Springs: Powerfully Antibacterial Waters for Skin Conditions →Sulphur Springs: Milky White Waters with Powerful Skin Benefits →

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Acidic springs contain hydrogen ions at 1 mg/kg or more (typically pH 2–3). Their strong antibacterial action is indicated for atopic dermatitis, plaque psoriasis, and epidermoid suppuration. Note: contraindicated for sensitive skin and elderly guests with dry skin — always confirm before bathing.