Pityriasis Lichenoides Chronica-Like Mycosis Fungoides: A Diagnostic Dilemma.

Mycosis fungoides (MF) is a neoplasm of the immune system. It is a cutaneous lymphoma originating in the peripheral epidermotropic T-cells, specifically the memory T-cells (CD45RO+). The etiology of MF is indefinite, but various factors, such as genetic and epigenetic abnormalities, environmental and occupational exposure to chemicals, infections, and cytokines (interleukin [IL]-2, IL-4, etc.), play a vital role. Pityriasis lichenoides (PL), such as MF, is a rare subtype that is presented with skin lesions similar to that of PL.