Children aged 2.2-7 lack autonomy. When you go outdoors, outdoors, under trees or under street lamps at night, you are often easily bitten by insects, or come into contact with pets such as pollen, dust, mites, cats and dogs' fur, which are easy to become allergic reasons. Children in childhood and infancy have low resistance and are prone to various infections, so diseases such as suppurative tonsillitis, pharyngitis, enteritis and upper respiratory tract infection can be the inducing factors of urticaria all year round. Older children and adolescents begin to be allergic to drugs, especially penicillin, causing urticaria.
Third, with the growth of age, infants and young children began to increase complementary food. At this time, eggs, meat floss, fish floss, fruit juice, vegetables and fruits can all be the cause of allergies. Preschool and school-age children often like to eat snacks, and there are many kinds of snacks and meals, so the probability of food allergy increases, such as nuts, fish, crabs, shrimps, peanuts, eggs, strawberries, apples, plums, citrus, various cold drinks, beverages, chocolates, etc., which may become allergic causes and lead to urticaria.