C43.11

Clinical Causes: Excessive exposure to ultraviolet (UV) radiation from the sun or tanning beds Presence of atypical or dysplastic moles that may transform into melanoma Family history of melanoma or other skin cancers Fair skin, light hair, or eye color, which offers less natural protection against UV damage History of skin burns or frequent sunburns during childhood or adolescence A weakened immune system Exposure to certain chemicals or carcinogens

Key Symptoms: A new, unusual, or changing mole or spot on the eyelid or canthus Asymmetry in the shape of a pigmented lesion Border irregularity with scalloped or poorly defined edges Uneven color with shades of black, brown, or even pink and white Diameter larger than 6 millimeters, although smaller lesions can also be concerning A lesion that itches, scuffs, or bleeds without injury Visible thickening or raised area on the eyelid Persistent redness or inflammation around the lesion Changes in sensation, such as tingling or numbness

Diagnosis Path: Diagnosis typically involves a thorough physical examination of the eyelid and surrounding structures. A dermatologist may perform dermoscopy—a specialized skin microscope—to closely assess pigmented areas. Confirmatory diagnosis requires a biopsy, where a small tissue sample from the suspicious lesion is examined microscopically to determine if melanoma cells are present. Imaging studies like MRI or CT scans may be used to evaluate for tumor spread, especially in advanced cases.

Treatment Protocols: Treatment approaches depend on the size, location, and stage of the melanoma. Common treatment options include: - Surgical excision: Removing the melanoma with a margin of healthy tissue to ensure complete removal. - Mohs micrographic surgery: A precise technique that removes the cancer layer by layer, examining each under a microscope until no cancer cells remain. - Sentinel lymph node biopsy: To assess whether the cancer has spread to nearby lymph nodes. - Immunotherapy: Employing medications to stimulate the immune system to attack melanoma cells, suitable for advanced cases. - Targeted therapy: Using drugs that target specific genetic mutations within melanoma cells. - Radiotherapy: Applying localized radiation in some cases where surgery isn’t feasible. - Regular follow-up: To monitor for recurrence or new lesions, including skin exams and imaging tests as needed.