What are Precancerous Skin Lesions?

Skin cancer may often be preceded by lesions called pre-cancers. The most well-known of these lesions is called actinic keratoses, which is considered an early form of squamous cell carcinoma. An actinic keratosis, a new or changing mole (nevi), and other unusual lesions on your skin should be carefully monitored and brought to the attention of your doctor.