D03.62

Clinical Causes: Ultraviolet (UV) radiation exposure from sunlight or tanning beds Having fair skin, freckles, or light-colored hair that is more susceptible to UV damage History of sunburns, especially early in life Multiple or atypical moles that increase melanoma risk Family history of melanoma or other skin cancers Immunosuppression or suppressed immune system Presence of certain genetic mutations or skin conditions

Key Symptoms: Appearance of a new mole or pigmented lesion Changes in the size, shape, or color of existing moles Uneven borders or irregular pigmentation within a lesion Lesion that is asymmetrical or has multiple colors such as brown, black, or tan Lesion that itches, becomes sore, or starts bleeding Presence of a raised or firmly pigmented patch on the skin Noticing a lesion that persists despite changes in environment or skincare

Diagnosis Path: Diagnosis typically involves a thorough skin examination by a healthcare professional, who will assess any suspicious lesions using visual and dermoscopic evaluations. A skin biopsy, where a small tissue sample from the suspected area is collected and examined microscopically, confirms the presence of melanoma in situ. Additional tests may include digital dermoscopy or photography to monitor changes over time. In some cases, sentinel lymph node biopsy or other imaging methods are used to rule out spread, although in situ melanoma usually remains localized.

Treatment Protocols: The primary treatment for melanoma in situ is surgical excision, aiming to remove the lesion with clear margins to prevent recurrence. The procedure often involves wide local excision, where extra tissue around the lesion is also removed. In certain cases, especially for larger or more difficult locations, other procedures such as Mohs micrographic surgery may be employed for tissue-sparing and complete removal. Follow-up care is essential to monitor for any signs of recurrence or new lesions. Protective measures against UV exposure, including the use of sunscreen, protective clothing, and avoiding peak sunlight hours, are important preventive strategies.