D04.4

Clinical Causes: Prolonged exposure to ultraviolet (UV) radiation from the sun or tanning beds Personal or family history of skin cancer Fair skin that is more susceptible to UV damage Chronic skin injuries or inflammation Exposure to certain chemicals or carcinogens Weakened immune system Advanced age, as risk increases with age

Key Symptoms: Persistent, rough, or scaly patches on the skin Red or brown sores that may bleed or crust over Lesions that do not heal within a few weeks Flat, pigmented, or slightly raised areas with irregular borders Sometimes asymptomatic, noticed only during skin examinations

Diagnosis Path: Diagnosis typically involves a thorough skin examination by a healthcare provider. If suspicious lesions are identified, a biopsy is performed to analyze the tissue microscopically. This confirms the presence of carcinoma in situ and helps distinguish it from benign skin conditions or invasive skin cancers. Additional imaging tests are rarely necessary unless there are concerns of wider spread or deeper invasion.

Treatment Protocols: Treatment options aim to completely remove or destroy the abnormal cells to prevent progression. Common approaches include: - **Surgical excision:** Physically removing the lesion with a scalpel. - **Cryotherapy:** Freezing the abnormal cells with liquid nitrogen. - **Topical treatments:** Application of medications such as imiquimod or fluorouracil to destroy abnormal cells. - **Photodynamic therapy:** Using light-sensitive medications combined with light exposure to target abnormal skin cells. Follow-up appointments are essential to monitor for recurrence or new lesions, especially for individuals with significant risk factors. Patient education about sun protection and skin self-exams further reduces the risk of future skin cancers.