If there is a small peeling-like change on the arm, you need to carefully observe the shape of the skin surface and self-perceived symptoms. If the peeling is purely dominant and confined to one area, it is considered to be caused by external irritation and friction, and can be recovered gradually with time without worrying. If the skin is red with itching, consider eczema-like dermatitis, you can choose to apply hydrocortisone butyrate ointment locally to make the symptoms subside quickly. If the skin is densely arranged with protrusions and dotted bleeding can be seen after scratching the skin flakes, consider plaque psoriasis in a limited area, which needs to be treated with carbotriol cream or fluticasone propionate cream. The symptoms are aggravated.