There are many reasons for skin allergy, such as alkalinity, irritation, contact with irritants, spicy peppers, irritating chemicals, etc., which may cause skin allergy. There are also useful hair dyes, or new eye masks, eye masks, direct contact with the skin may cause allergies. This is skin allergy caused by direct contact.

There are also inhalants, such as dust mites, acaroid mites, dust, a lot of pollen in spring, tree powder and grass powder, which will cause a series of allergic reactions after inhalation. It may be manifested as erythema and papules on the skin, accompanied by obvious itching symptoms, which is the manifestation of skin allergy. There is also food, such as staple food, meat, eggs and tropical fruits, which may cause allergies, and food additives may also cause skin allergies. The symptoms of further infection may also cause pathological reactions of the body, such as erythema, papules, skin allergies and itching.