Papular urticaria, also known as insect bite dermatitis, is mainly caused by insect bites. Due to the decrease in immune system, insect bites are infused with insect fluids, causing immune dysfunction and resulting in allergy. According to the performance of the lesions, drugs with anti-itch and anti-inflammatory effects can be selected and applied externally through lotions and emulsions to relieve itching. It can also be treated internally by taking calcium lactate or calcium gluconate tablets orally, usually together with antihistamines, which have some effect. Vitamin C or B12 can be used, in combination with antihistamines, for better therapeutic effect. Drugs with antihistamine effect and sedative effect are usually used, such as benadryl, fenagan, paracetamol, cyproheptadine, etc. Chinese medicine treatment can be used to dispel wind and clear heat, such as Siwu Tang or Qingfeng San decoction, one payment per day, also has some effect. Avoid fish, shrimp, crab, sea clams, fish, beef and mutton and other stimulating food, so such food is easy to produce wind and heat, which can give rise to the disease. Avoid eating chili, pepper, cinnamon, onion, curry, tobacco and alcohol, these foods can help heat and blood, which can trigger the occurrence of the disease. Avoid eating fried and fatty foods. If there is secondary infection, it is appropriate to control the infection first. Avoid direct contact with allergens to avoid allergic reactions. The lesions produced by papular urticaria are mostly composed of erythema, papules and papules, and usually last two to three weeks per batch.