<unk>  is a small, rough, raised area found on skin that has been exposed to the sun over a long period of time.
Over many years, some<unk>  may develop into a type of skin cancer.
Actinic keratosis
Inverted follicular keratosis
Nevus comedonicus
Lichen nitidus
Eccrine nevus
Porokeratosis
Actinic granuloma
White sponge nevus