An immunohistochemical staining of epidermal Langerhans' cells in tinea cruris.

Epidermal Langerhans' cells (LC) were investigated in fresh cryostat sections of ten biopsies from patients with mycologically proven tinea cruris, using OKT6 monoclonal antibodies and avidin-biotin-immunoperoxidase. Compared to the controls, more epidermal LC and an increased number of LC in the upper half of the epidermis were found in the sections from tinea patients. In a double staining method for both OKT6-positivity and hyphae, a tendency towards a gathering of LC and fungal elements was found. The results of this study are in agreement with the theory that epidermal LC are responsible for the antigen uptake in dermatophytosis.