D04.39

Clinical Causes: Prolonged exposure to ultraviolet (UV) radiation from the sun or tanning beds Fair skin that is more sensitive to UV damage History of sunburns or excessive sun exposure over time Use of certain tanning devices Age-related skin changes, typically affecting older adults Weakened immune system which may impair skin’s ability to repair damaged cells Genetic predisposition that may increase susceptibility to skin cancers

Key Symptoms: Persistent rough, scaly patches or lesions on the face Red or pink growths that may be slightly raised Lesions that do not heal or tend to bleed easily Changes in the appearance of skin patches, with possible ulceration Pigmented or non-pigmented, flat or raised lesions that are asymptomatic Areas of skin that are itchy or tender

Diagnosis Path: Diagnosis typically involves a thorough skin examination by a healthcare provider. If a suspicious lesion is found, a biopsy will be performed to confirm whether it is carcinoma in situ. The biopsy sample is examined under a microscope to identify atypical cells confined to the epidermis without invasion into deeper layers. Additional imaging or tests are rarely required unless there is suspicion of more extensive disease. The diagnosis helps distinguish carcinoma in situ from invasive skin cancers and other skin conditions, guiding appropriate treatment planning.

Treatment Protocols: Treatment options focus on removing or destroying the abnormal cells to prevent progression into invasive cancer. Common approaches include: - **Cryotherapy:** Freezing the lesion with liquid nitrogen to destroy abnormal cells. - **Topical medications:** Such as fluorouracil or imiquimod, which encourage immune response or directly target abnormal cells. - **Photodynamic therapy:** Using light-sensitive drugs and light exposure to destroy abnormal tissue. - **Surgical excision:** Removing the lesion surgically for definitive treatment. - **Curettage and electrodesiccation:** Scraping away the lesion followed by cauterization. Follow-up care is essential to monitor for recurrence or new lesions, especially in individuals with ongoing risk factors like UV exposure. Prevention strategies such as sun protection and skin examinations are recommended for maintaining skin health.