Precancerous lesions for squamous cell carcinoma (SCC) are called "actinic keratoses" (AKs). They look like a red or brown patch of sun damage. A suspicious area tends to be crusty and dry, and it may bleed. Though these lesions may not become cancerous, they have a good chance of being precursors of SCC. If treated early, however, AKs can be eliminated before becoming skin cancer.
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