Needle size on the skin

The incidence of itchy spots is limited to adults. The course is chronic. Occurs in bone bulges or areas subject to friction, such as behind the ears, shoulder blades, hips, groin, and joints, etc., and more asymmetric. One or more needle-sized itching points appear on the normal-looking skin surface, and the itching is paroxysmal. The number of attacks in a day varies from one minute to one hour or longer.