A 30 years old male presented with silvery scales on elbow and knee, that bleed on removal. The probable diagnosis is –

Morphology of papules/plaques in various papulosquamotas disorders Psoriasis - Erythematous papules and plaques on extensors (elbow & knee Lichen planus - Violaceous papules with Wickham's striae an flexural surface Pityriasis rosea - Annular plaques on Trunk Seborrheic dermatitis - Yellowish, follicular papules on scalp and face  Pityriasis rubra pilaris - Erythematous follicular papules on Trunk & dorsum of hand Secondary syphilis - Dusky erythematous papules Pityriasis lichenoides et varioliformis acuta - Erythematous edematous papules surmounted by vesicles/crust Coming to question Clues in this question are :- Characterstic scales → silver scale Involvement of elbow & knee Bleeding on scale removal → Auspitz sign