Psoriasis Common Sites, Types, Investigation and Treatment This is psoriasis part 2, Psoriasis part 1 -(psoriasis etiology, pathogenesis and clinical features) Psoriasis comes from Greek word, meaning "itching condition" (psora "itch" + -sis "action, condition"). Psoriasis common sites: Extensor surface Scalp Nails Elbow Knee Sacral region Psoriasis … [Read more...] about Psoriasis – Common Sites, Types, Investigation and Treatment