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What is A 30 years old male presented with silvery scales on elbow and knee, which bleed on removal. The probable diagnosis is: and explain in detail?
Ans. C. PsoriasisPsoriasis* Silvery white scales (due to air trapped between scales)* Removal of scales lead to appearance of punctuation/ pinpoint bleeding points (Auspitz sign)* Grattage test: Scratching with a glass slide accentuates scale formation in a psoriatic plaque.* Scales are absent in flexural psoriasis and on glans in un-circumscribed patients* Scaling is profuse in elephantine and rapid psoriasis.Seborrheic dermatitis* Greasy scalesPityriasis rosea* Collarette scales which are attached to peripheral edge and free towards center