Diagnosis
Physicians can usually identify actinic keratosis by doing a thorough examination; in principle actinic keratosis is a clinical diagnosis. A biopsy may be necessary when the keratosis is large or thick, to make sure that the lesion is a keratosis and not a skin cancer. Seborrheic keratoses are other lesions that appear in groups as the actinic keratosis do, but are not caused by sun exposure, and are not related to skin cancers. Seborrheic keratoses may be mistaken for an actinic keratosis.
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