A patient presents with erythematous scaly lesions on extensor aspect of elbows and knee. The clinical diagnosis is got by –
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.
Auspitz sign
KOH smear
Tzanck smear
Skin biopsy