Actinic Keratoses (AKs) are rough, scaly spots that occur on skin that has been exposed to the sun over a period of years. These lesions are the result of damage to the skin by the sun’s ultra violet radiation. AKs are usually small at first and sometimes a stinging sensation is noted. The number of AKs ranges from one or a few to many. AKs are cancerous lesions, but they can usually be completely cured with liquid nitrogen applied by your dermatologist. These lesions can progress to squamous cell carcinoma, so prompt diagnosis and treatment is recommended.