Abstract
There are three hot springs having distinctive water quality in the Tohoku district of Japan.
They are described below.
1) Tamagawa hot spring
Acidic hot sulfur spring, pH: 1.3. Main components: H2SO4 and HCl. Headspring temperature: 98°C.
Effect on the skin (during bathing at 42°C): stimulation, sedation of itching, bacteriocidal function, crust formation, etc.
Dermatological curative indications: Neurodermatitis constitutionalis or chronic prurigos, impetigo, trichophytia, psoriasis vulgaris, etc.
2) Hikage hot spring
Neutral hot sulfur spring, pH: 6.5.
Evaporated residue (NaCl, CaCl2, Mg(HCO3)2, KCl, MgCl2): 14g/1, H2S: 136mg/1,
Headspring temperature: 43°C
Effect on the skin: sedation of itching, bacteriocidal function, high osmotic pressure, regeneration of skin, etc. Dermatological curative indications: contact dermatitis (eczema), chronic prurigos, urticaria, psoriasis vulgaris, acne, scabies, etc.
3) Shin-Appi hot spring
Brine, pH: 7.0. NaCl: 20g/1. Headspring temperature: 53°C.
Effect on the skin: High osmotic pressure, coagulation of protein, bacteriocidal function, crust formation, etc. Dermatological curative indications: psoriasis vulgaris, chronic prurigos, pernio, erythema exsudativa multiforme, burn, pemphigus vulgaris, hemorrhoids, bedsores, etc.
