Cutaneous T-cell lymphoma is a rare type of cancer that often has skin symptoms, which may be a doctor's first clue that a patient has this disease. It affects the skin with rash-like patches and tumors. T-cell lymphoma may also affect the blood, lymph nodes, and internal organs. Although it's not curable, it is treatable, explains Yale Medicine dermatologist Michael Girardi, MD, who is an expert in treating this disease. Photopheresis, a blood-filtering technique, was developed at Yale and is one method he uses at Yale Medicine to treat this disease. Other treatments for T-cell lymphoma can include topical or oral medications, phototherapy (light therapy) and electron-beam therapy.