DR P. MARAZZI / SCIENCE PHOTO LIBRARY DR P. MARAZZI / SCIENCE PHOTO LIBRARY
Pityriasis amiantacea scaling on a 71-year-old woman's neck. This is a form of scalp psoriasis. Psoriasis is a common skin disease involving a large increase in the speed of epidermal (outer skin layer) cell production. Thick plaques of dead skin (yellow) are seen adhering to the skin. This condition may resist treatment and may lead to hair loss. Treatment is with topical (skin) creams, but the condition cannot be completely cured. The cause of psoriasis is unknown but certain infections, drugs and stress are known to trigger attacks.
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