Cutaneous T-cell lymphoma is a rare type of cancer that begins in the white blood cells and attacks the skin. Cutaneous T-cell lymphoma is one of several types of lymphoma collectively called non-Hodgkin lymphoma.

Cutaneous T-cell lymphoma can cause rash-like skin redness and, sometimes, skin tumors. Treatments can include skin creams, light therapy, medications and radiation therapy.

Several types of cutaneous T-cell lymphoma exist, including mycosis fungoides and Sezary syndrome.