D04.71

Clinical Causes: Prolonged exposure to ultraviolet (UV) radiation from sunlight or tanning beds Fair skin that is more susceptible to UV damage Repeated skin injuries or inflammation Weakened immune system due to conditions or medications History of previous skin cancers or precancerous skin lesions Certain genetic factors that increase risk

Key Symptoms: Appearance of a new, persistent skin sore or patch that does not heal Lesions that are scaly, crusted, or wart-like in appearance A firm or rough area on the skin that may be red or skin-colored Often asymptomatic, but some lesions may be itchy, tender, or bleed Lesions primarily located on sun-exposed areas, such as the lower limbs and hips

Diagnosis Path: The diagnosis of carcinoma in situ of the skin involves a combination of physical examination and biopsy. The healthcare provider will inspect the suspicious lesions and may perform a skin biopsy, where a small sample of affected tissue is removed and examined under a microscope. This confirms the presence of abnormal cell growth confined to the outer layer. Additional diagnostic tests, such as dermoscopy or imaging, may be used for further assessment if necessary.

Treatment Protocols: Treatment options for carcinoma in situ of the skin generally focus on complete removal of the abnormal cells to prevent progression to invasive cancer. Common treatments include: - Surgical excision: Removing the lesion with a margin of healthy tissue - Cryotherapy: Freezing the abnormal cells with liquid nitrogen - Topical medications: Such as 5-fluorouracil or imiquimod to destroy cancerous cells - Photodynamic therapy: Using light-sensitive medication activated by light to target abnormal cells Follow-up care involves monitoring the site for recurrence or new lesions, practicing sun safety to prevent future cases, and regular skin examinations by a healthcare professional.