Mycosis fungoides is a rare kind of skin cancer called cutaneous T-cell lymphoma (CTCL). Also called granuloma fungoides, this skin disease may look like a fungal rash but is not caused by a fungus.

Mycosis fungoides is a rare type of blood cancer that starts in the skin. It often involves a rash that does not go away, can appear anywhere on the skin, and may be itchy. Early treatment can be ...