Why skin stays dry despite moisturizer, which deficiencies and diseases cause xerosis, how dry skin differs from eczema, and when it needs a doctor's care.

8 million Americans live with psoriasis. Most manage it with steroids that cause skin atrophy, coal tar classified as a Group 1 carcinogen, or biologics costing $25,000+ per year. In 2026, the gut-skin axis research confirms psoriasis is an inside-out condition — and no topical treatment alone addresses the systemic drivers. The complete clinical guide: plaque psoriasis types, triggers, TSW, skin of color, and the plant-based Dermotricology protocol.