A<unk>  is a premalignant keratotic skin lesion that may arise in a variety of long-standing, nonscarring, inflammatory processes such as cutaneous lupus erythematosus for example.
Reactional keratosis
Arsenical keratosis
PUVA keratosis
Hydrocarbon keratosis
Actinic keratosis
Diabetic dermadrome
Seborrheic keratosis
Dermal cylindroma