The skin tied with a belt itches and bumps, which is thought to be caused by skin allergy. The principle of treatment is consistent with eczema, and antiallergic drugs can be used for treatment, including topical application of glucocorticoid to relieve itching symptoms. But it is important to avoid contact with allergens again.

It is considered to be allergic reactions such as eczema and dermatitis, and the problem is not big. It is recommended to take one tablet of loratadine tablets orally every day. Mometasone furoate cream and moisturizing cream for external use, except medication, minimize irritation: 1. Be careful not to squeeze or scratch. 2. Avoid alcohol and cigarettes, including second-hand smoke, and eat less foods with high calorie and irritation, such as sweets, fish, shrimp and spicy mutton. 3. Do not heat, including steaming and bathing. 4. Change clothes frequently (loose cotton light-colored clothes, don't wear tights) and expose the bedding to the sun. 5. Don't keep animals at home. Where there are many flowers and trees, go out less.

It could be hives. You'd better go to the hospital dermatology department. It may be caused by sweating and cold wind allergy. You can apply calamine lotion to relieve itching.

Wear loose cotton soft clothes, wash and change frequently, don't tighten your belt, dry it in time when sweating, don't blow cool air when sweating, stay away from wet paint and pollen, and eat less spicy fish, shrimp and seafood.

You can take oral antiallergic drugs, apply 100 kinds of drugs, try to wear skirts in summer, don't wear too tight underwear, and don't scratch with your hands.