C43.9

Clinical Causes: Excessive exposure to ultraviolet (UV) radiation from the sun or tanning beds. Having fair skin that burns easily and does not tan well. A history of sunburns or significant sun exposure during childhood and adolescence. Presence of numerous or atypical moles, which may increase the risk. A family history of melanoma or other skin cancers. Compromised immune system, such as in organ transplant recipients or individuals with certain medical conditions. Genetic mutations that predispose individuals to melanoma.

Key Symptoms: The appearance of new or changing moles, spots, or lesions on the skin. Asymmetry in the shape of a pigmented area, with one half unlike the other. Borders that are irregular, scalloped, or poorly defined. Multiple colors within a single lesion, including shades of brown, black, blue, red, or white. A diameter larger than 6 millimeters (about the size of a pencil eraser), though smaller melanomas are also possible. Itching, tenderness, or pain in a pigmented lesion. Presence of a sore that does not heal or a lesion that bleeds or oozes. Unusual skin pigmentation or the appearance of a new pigmented lesion that looks different from others.

Diagnosis Path: Diagnosis of malignant melanoma involves a combination of physical examination and tests, including: - Visual inspection of the skin to identify irregular moles or lesions. - Dermoscopy to assess pigmented skin lesions more clearly. - Skin biopsy, where a sample of the suspicious lesion is removed and examined microscopically for malignant melanoma cells. - Imaging tests such as ultrasound, CT scans, or PET scans to determine if the melanoma has spread (staging).

Treatment Protocols: Treatment options for malignant melanoma depend on the stage and location of the tumor, and may include: - Surgical excision to remove the primary tumor with some surrounding healthy tissue. - Sentinel lymph node biopsy to check for spread to nearby lymph nodes. - Immunotherapy to stimulate the immune system to attack melanoma cells. - Targeted therapy to interfere with specific genetic mutations in melanoma cells. - Radiation therapy, especially if the cancer has spread to other parts of the body. - Chemotherapy, although less commonly used as newer therapies have become more effective. Early detection and treatment are vital for improving outcomes and reducing the risk of metastasis. Regular skin checks and protection against UV exposure are recommended preventive strategies.