A patient presents with erythematous scaly lesions on extensor aspect of elbows and knee. The clinical diagnosis is got by –
Auspitz sign
KOH smear
Tzanck smear
Skin biopsy
Erythematous scaly lesions on extensor aspect of elbow and knee favours the diagnosis of Psoriasis.
The clinical diagnosis of psoriasis can be made by demonstrating Auspitz sign.
It is a characteristic finding of psoriasis in which removal of scale leads to pinpoint bleeding.