Skin Day (Hifu no Hi) — November 12th "Good Skin" Wordplay

What Is November 12th "Skin Day"?

November 12th is "Skin Day," established in 1989 by the Japanese Society for Clinical Dermatology through a wordplay where 11, 1, and 2 read as "ii (good) hi (skin) fu." The goal is to spread accurate knowledge about skin health and skin conditions, and to deepen understanding of dermatology as a medical specialty. Lectures, free consultations, and skin screenings are held nationwide as part of awareness activities. The skin is the body's largest organ, playing crucial roles in defense, temperature regulation, and sensory perception.

The Structure and Functions of Skin

Skin has a three-layer structure

The skin consists of three layers: the epidermis, dermis, and subcutaneous tissue. The epidermis, with its keratin layer and sebum film, defends against external irritants and bacteria. The dermis, made of collagen and elastin, maintains elasticity and strength. The subcutaneous tissue's fat layer provides cushioning and insulation. When this structure breaks down, problems like dryness, inflammation, and allergic reactions become more likely.

Important functions of the skin

The skin provides barrier protection against UV rays, chemicals, and pathogens, regulates body temperature through sweat glands, handles sensory perception (touch, pain, temperature), and synthesizes vitamin D. A weakened barrier function can lead to conditions like atopic dermatitis and contact dermatitis, and can also affect overall immunity. Daily skin care is aimed at maintaining and strengthening these functions.

Common Skin Issues and How to Address Them

Dryness, eczema, and itching

In autumn and winter, dryness reduces ceramide levels and weakens the skin's barrier function, making post-bath moisturizing especially important. Apply ceramide-containing cream within 3 minutes of bathing, and keep baths under 10 minutes in water below 40°C (104°F). If symptoms persist for more than two weeks, a topical steroid may be needed, so it's recommended to see a dermatologist.

UV damage and dealing with dark spots

For protection against UVA and UVB rays, use SPF50+ and PA++++ sunscreen, reapplying every two hours, and combine with hats and parasols. Sudden changes in moles or spots (asymmetry in color, shape, or size) could indicate melanoma, so it's important to see a dermatology specialist within a month if you notice such changes.

When to See a Dermatologist, and How to Find Reliable Care

You should seek immediate medical attention if symptoms last more than two weeks without improvement, worsen or spread rapidly, involve pain, bleeding, or pus, or are accompanied by fever or fatigue. Treatment based on guidelines published by the Japanese Dermatological Association reflects scientifically grounded medical care, and checking for a university hospital or board-certified dermatologist's credentials helps ensure reliable treatment. Avoid self-diagnosis or questionable alternative remedies, and opt for standard, insurance-covered treatments.

Lifestyle Habits Worth Reconsidering on Skin Day

Actively consume vitamins A, C, and E, zinc, and ceramide-rich foods (nuts, seafood, mushrooms), aim for at least 7 hours of sleep, and manage stress. Wash your face twice a day using a foaming net, and follow a three-step moisturizing routine of toner, emulsion, and cream. Quitting smoking and moderating alcohol intake also help prevent skin aging.

In Summary

November 12th's Skin Day was established by the Japanese Society for Clinical Dermatology to raise awareness of skin health. Understanding the skin's three-layer structure and many functions, and practicing evidence-based care, can help prevent problems. If symptoms persist, be sure to consult a specialist, and use your skin as a window into your overall health.