Value Village ／ Beauty
This answer is a draft. It stays unpublished until legal review and source verification are complete.
In Japan, where most people soak in a bath every day, complaints that "the bath dries my skin" cluster in winter. Abroad the standard advice is "keep showers short." This article sets out how bath temperature, time and washing method relate to the skin's moisture.
| Item | Guide | Reason |
|---|---|---|
| Water temperature | Around 40°C (104°F) (41°C (106°F) or below, about 10 minutes is the guide for preventing bathing accidents) | 42°C (108°F) and above strips sebum easily and leads to itching |
| Time | 10–15 minutes | Long soaks wash out the water-holding substances in the stratum corneum |
| Washing | With foam, using your hands or a soft towel. Do not scrub with a nylon towel | Friction causes dryness and pigmentation (friction melanosis) |
| How often to wash with soap | Oily areas (face, armpits, feet, groin) every day; arms and legs can have water-only days if you have not sweated | General dermatological guidance |
| After the bath | Moisturise within 5–10 minutes (some people apply it in the bathroom) | Evaporation leaves skin drier than before — "over-drying" |
| Bath additives (入浴剤, nyūyokuzai) | Moisturising types (ceramides, oils) suit people with dry skin. Check the label on sulphur and carbonated types | See the bath additives article |
[Verify] Check the Japanese Dermatological Association's lifestyle guidance on sebum deficiency and the Consumer Affairs Agency's guide figures on bathing accidents.
Evaporation afterwards can leave it drier than before. 10–15 minutes, then moisturise straight away.
42°C and above strips sebum and causes itching. Around 40°C removes dirt perfectly well.
Dermatologists know it as a cause of friction melanosis (pigmentation). Roll the foam over the skin with your hands or a soft towel.
Over-drying sets in within 5–10 minutes. More people now apply moisturiser straight after leaving the bathroom, or inside it.
The main cause of winter itching is dryness, and over-washing makes it worse. Itching that continues despite moisturising should go to a dermatology clinic (covered by Japanese health insurance).
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https://www.dermatol.or.jp/qa/
https://www.caa.go.jp/policies/policy/consumer_safety/caution/
https://www.e-healthnet.mhlw.go.jp/
⚠️ Editorial note: the source URLs above were identified by search. Our working environment cannot reach go.jp domains, so the contents have not been checked against the text. Verify every source before publication and record who checked it and when.
What we share here are ideas and everyday practices passed down among people living in Japan, together with general information drawn from public sources. They are not official recommendations, and they are not professional instruction. Practices vary between households and regions.
This is general information. Results vary from person to person and depend on your own conditions and surroundings.
Please decide for yourself, using your own judgement, whether any of this suits your situation. We cannot accept responsibility for any damage, loss or injury arising from following this article.
Cosmetics are not medicines and are not meant to diagnose, heal or prevent any condition. If your skin reacts, stop using the product and see a dermatologist.
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