A 35 year old male presented with silvery scales on elbow & knee that bleed on removal . The probable diagnosis is
Correct answer : b
Psoriasis vulgaris is Well demarcated erythematous indurated plaque with silvery white (mica like) scaling over scalp, extensors , (elbows ,knees ,knuckles & lower back) , palms & soles .
Silvery white scaling is due to the presence of air trapped in between scales.
Auspitz sign: Scratching of lesion of psoriasis with a glass slide leads to pinpoint bleeding as the end result and it is known as Auspitz sign.