Cutaneous lymphoma is an uncommon form of lymphoma that affects the skin rather than the internal lymph nodes. The most common type, called epitheliotropic lymphoma (similar to mycosis fungoides in humans), arises from T-lymphocytes that invade the outer layers of the skin. It typically progresses slowly at first, often mimicking common skin diseases such as dermatitis or allergies, which can delay diagnosis. As the disease advances, patches and plaques may develop into raised nodules and ulcers. A less common non-epitheliotropic form arises from B-lymphocytes and tends to have a somewhat better outlook. Cutaneous lymphoma is generally a chronic, progressive disease that is managed rather than cured, with treatments aimed at controlling symptoms and slowing progression.