A. What is allergic skin disease Allergic skin disease is a skin disease caused by allergens, specific allergens can be divided into contact allergens, inhalation allergens, ingested allergens and injected allergens four categories. Each type of allergens can cause the corresponding allergic skin disease, the main performance is a variety of dermatitis, eczema, urticaria, etc.. Second, how to detect allergens The detection of contact allergens is mainly done through patch testing, such as jewelry, cosmetics, clothing, and allergies caused by renovation. The detection of inhalant and ingestive allergens is mainly done through blood tests for specific antibodies, but also through skin tests like the penicillin skin test (prick test). Some patients may be allergic to some physical factors, such as cold, heat, ultraviolet light and external pressure, etc. These can be confirmed by the corresponding tests, such as ice test, erythema determination, skin pressure test, etc. What are the common allergens? 1. Common ingested allergens: shrimp, crab, milk, eggs, beef and mutton, mango, mushrooms, cocoa, garlic, nuts, seasonings and preservatives contained in food. 2, common contact allergens various chemical substances such as cosmetics, detergents, metal ornaments containing nickel or chrome, cement; dyes, pigments, chemical fabrics; plant-based lacquer, nettles, insecticides, pesticides, pollen; biological: insect venom, poisonous hair, animal fur. 3.Common inhalation allergens Dust mites, pollen, mold, animal fur, feathers, cotton wool, etc. 4, common injected allergens injected allergens are mainly some drugs (such as antibiotics), biological products (such as vaccines, blood plasma), etc.. Prevention of common allergens Dust mites: 1. Keep the room clean and sanitary, and clean the room regularly. Clean with a wet rag to avoid raising dust, and it is best to wear a mask when cleaning. 2. Dry bedding regularly, change and wash bed sheets and covers regularly; do not use pillows made of feathers, down or cotton, etc., and replace the pillow insert at least once a year. 3, it is best not to lay carpets in the living room, without heavy fabric curtains and fabric sofas. 4, it is best not to play plush toys, because soft plush toys easily become a breeding ground for dust mites. 5, often clean the air conditioning dust cover. 6.Do not keep flowers and pets. Pollen prevention: 1. Reduce outdoor activities during the daytime in the pollen dispersal season, especially at times of the day when the pollen index is high (such as in the evening on sunny days), and go out as much as possible when the pollen index is lowest, such as in the early morning or after rain. If you go out when the pollen index is high, you should change into clean clothes when you return home. 2. Use glasses with lenses instead of contact lenses, and bring sunglasses when you go out to reduce the effect of pollen on your eyes. 3.Don’t dry your clothes outdoors during the pollen dispersal season, and dry them inside the house as much as possible (using a clothes dryer is better) to avoid pollen staining your clothes, sheets and bed sheets. 4, pollen dispersal season can be used about half a month in advance anti-allergy drugs to reduce or avoid the onset of allergies after contact. Mold prevention: 1, keep indoor ventilation and dry, such as the possibility of using dehumidifiers, keep indoor humidity at 50% or more. 2.Use ventilation fans to ventilate and dehumidify when bathing and cooking, bathrooms and kitchens should be kept clean and dry. 3.Trash cans should be placed outdoors to clean up the garbage in the kitchen and other places in a timely manner. 4, indoor and balcony try not to put potted plants, because the soil may also breed mold. 5.Moldy carpets, clothes, books, etc. should be dealt with as soon as possible, avoid using carpets and upholstery. 6.Frequently defrost the refrigerator, clean and keep it dry. 7.Clean and replace the air conditioner and air filter screen regularly. 8.Do not clean up dead leaves and garbage, avoid contact with soil, compost, etc. Try to avoid staying in indoor swimming pools, steam baths, greenhouse flower houses and places with more dead grass.