In some cases, squamous cell carcinoma may emerge from a precancerous condition called actinic or solar keratosis. Beginning as pink, flat, rough lesions on the skin, actinic keratosis areas may rise above the skin and become hard. Skin cancer screenings are vital for detecting actinic keratosis and other precancerous skin lesions. When caught early, they are usually easy to treat with photodynamic therapy or topical chemotherapy.

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