Cutaneous lymphoma is a type of cancer that originates in the skin's lymphatic tissue. It is a form of non-Hodgkin lymphoma and can manifest as rashes, lesions, or tumors on the skin. This condition occurs when lymphocytes, a type of white blood cell, grow uncontrollably in the skin. There are several subtypes of cutaneous lymphoma, including mycosis fungoides and Sezary syndrome. Diagnosis typically involves a skin biopsy, and treatment options may include topical therapies, radiation therapy, or systemic medications. Early detection is crucial for effective management of the disease.