Actinic keratosis, simply put, is a scaly, rough patch on the skin which results from years of sun exposure. It is commonly found on the neck, scalp, forearms, back of the hands, ears, lips, or face. The size varies from a small inch to about a diameter, and when left untreated, such areas of the skin can turn into a serious type of skin cancer. Change in the color of the skin (brown,...