A solar keratosis is a small, thickened, scaly growth which develops on the skin. It is the most common skin condition resulting from sun-damaged skin. Solar keratoses are also known as actinic keratoses. Solar keratoses usually develop on areas of skin which have received a lot of sun exposure. They are usually harmless, but there is a small risk that they may eventually turn into skin cancer. In themselves, solar keratoses are not cancerous.
This is a companion discussion topic for the original article at https://patient.info/medicine/fluorouracil-for-sun-damaged-skin-efudix-actikerall-carac