occurs because of repeated scratching, may appear as small, and flat areas (plaques) of various sizes, 1 to 10 inches (2.5 to 25 centimeters) in diameter. These areas have definite margins that have become thick and leatherlike (lichenified). This type of dermatitis is also known as lichen simplex chronicus can occur when something such as a tight garment rubs or scratches your skin. This irritation may lead you to rub or scratch your skin repeatedly. Common locations include ankles, wrist, outer forearm or arm, and the back of your neck.