Skin Psoriasis d04cb8f3 Most common site affected by psoriasis is? A Flexor surface B Extensor surface C Palms and soles D Oral mucosa High-Yield Explanation ANSWER: (B) Extensor surfaceREF: Rook's textbook of dermatology 7th e p. 35.1"Most commonly involved areas in psoriasis is Extensor aspect of knees, elbows & Scalp"