Actinic keratosis (AK) is abnormal growth of the skin. It results in a rough, scaly, or crusted patch of skin. AK tends to occur on sun-damaged skin.

AK is not cancer but it can sometimes change to squamous cell skin cancer. Treatment includes removing lesions and monitoring for skin cancer.

Actinic Keratosis
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AK is caused by long term excessive sun exposure. Ultraviolet rays from sunlight can cause skin damage. Over time, this damage can cause abnormal growth of the skin such as AK.