Skin

Skin is the outer organ: barrier, sensory surface, vitamin D factory, and display of internal energy. Dryness, inflammation, slow healing, and gray tone track low thyroid, low vitamin A, copper-iron imbalance, and PUFA oxidation.

Internal mirrors

Progesterone and thyroid improve skin quality in the primary literature. Excess cortisol thins skin. Free unsaturated fats and iron feed age pigment and damage. See Thyroid, Progesterone, Cortisol, Vitamin A, Copper, Iron, PUFA.

Light both makes vitamin D and, in excess UV, damages; red light supports respiratory enzymes in deeper tissue. See Light, Red light, Vitamin D3.

Practice

Heal from inside: food, thyroid, minerals, lower seed oils. Topical steroids are short tools with rebound risk. See Topical steroid withdrawal, Harm reduction.

Burns

Burns destroy the skin barrier through heat, chemical, or electrical injury. Severity is judged by depth (first through third degree) and the percentage of body surface involved. Cool a minor burn under running water for 10-20 minutes; do not use ice, which can worsen tissue damage. Cover loosely, avoid butter or oils on the wound, and seek emergency care for large, deep, or facial/genital burns, or any burn on a child or older adult. Direct Peat commentary on burn first aid specifically is not established in the corpus searched for this page; his broader framework on wound healing (adequate protein, vitamin A, and hormonal balance) applies to recovery once the acute injury is stabilized.

UV nail dryers and cell damage

UV-emitting nail polish dryers used for gel manicures cause DNA damage, cell death, and cancer-associated mutations in exposed skin cells, the same category of damage as other UV sources. Across mouse and human cell lines, a single 20-minute irradiation killed 20-30% of cells, and three consecutive 20-minute sessions killed 65-70%.

See also

• Thyroid
• Vitamin A
• Copper
• Light
• Topical steroid withdrawal
• Wound
• Scar