D03.22

Clinical Causes: Prolonged exposure to ultraviolet (UV) radiation from sunlight or tanning beds History of sunburns, especially during childhood Presence of numerous or atypical moles in the affected area Fair skin, light hair, or eye color, which increase susceptibility Previous skin cancers or family history of melanoma Immunosuppression due to medications or medical conditions Chronic skin irritation or injury in the area

Key Symptoms: Flat or slightly raised pigmented lesion in the left ear or external auricular canal Irregular borders or uneven coloration within the lesion Changes in size, shape, or color over time Itching or tenderness in the affected area Bleeding or crusting on the lesion surface Sometimes, the lesion may appear as a non-healing sore

Diagnosis Path: Diagnosis typically involves a thorough physical examination of the skin, focusing on the lesion's appearance and characteristics. Dermoscopy, a non-invasive imaging technique, may be used to better assess the lesion's features. A definitive diagnosis requires a skin biopsy, where a small sample of tissue is removed and examined microscopically for malignant cells. Further staging or assessment might involve imaging studies if invasion or spread is suspected, though in situ melanoma is confined to the epithelial layer.

Treatment Protocols: Treatment options primarily include surgical excision, where the lesion and a margin of surrounding healthy tissue are removed to ensure complete removal. Mohs micrographic surgery may be preferred for preserving tissue in the ear area and minimizing cosmetic impact. Alternatives such as cryotherapy or laser therapy are less commonly used but may be considered in certain cases. After treatment, regular skin monitoring is recommended to detect any recurrences or new lesions early. Additional therapies are generally not needed for melanoma in situ, but close follow-up is essential to prevent progression.