Antibody deposits in Tzanck smears in pemphigus vulgaris

Forty‐three patients, including 24 males and 19 females between 5 and 62 years of age, having pemphigus vulgaris (27), pemphigus foliaceus (1), bullous pemphigoid (3), chronic benign bullous dermatosis of childhood (2) and herpes zoster (10) were included in this study. Tzanck smears were prepared from the floor of the blisters in these patients by deroofing the bullae, and the slides were stored without fixation at room temperature for 1 to 10 days. Immunofluorescence staining was done with FITC‐conjugated anti‐human IgG. Twenty‐one cases having pemphigus vulgaris and 1 case having pemphigus foliaceus showed bright green fluorescence on the membrane of acantholytic cells. No epithelial cells were seen in smears from bullous pemphigoid and chronic benign bullous dermatosis of childhood, whereas epithelial cells were seen in 10 cases of herpes zoster. These stained negative with anti‐IgG. Storage of the prepared smears for 1–10 days did not seem to affect the results of immunofluorescence. Tzanck smears can be used as an easy substitute for skin/mucosal biopsy for the direct immunofluorescence test.