Expression of helper T cell master regulators in inflammatory dermatoses and primary cutaneous T-cell lymphomas: Diagnostic implications

A predominance of T-bet+ T cells in the epidermis support patch stage MF over dermatitis. A predominance of GATA-3+ T cells in the dermis support CD30+ MF with large cell transformation over C-ALCL. These stains do not allow distinction between dermatitis and cutaneous infiltrates of SS.