The disease can be described as an exogenous allergic reaction caused by arthropod bites. When the patient is bitten by an arthropod, such as bedbugs, fleas, mosquitoes, worms, etc., the saliva of the insect can be injected into the skin, and if the person has a predisposition to allergic qualities, then the disease can be caused by several bites over a few days. The scientific name of this disease papular urticaria, also known as urticarial moss (lichenurticatus), is a common allergic skin disease in infants and young children, common in summer and autumn, clinically characterized by scattered, the nature of a slightly hard, small blisters at the top of the papules, surrounded by a fusiform red halo, self-consciousness itchy, can be repeated scratching and caused by pustulosis and so on. Main performance Redness, swelling, blisters and bumps can appear after biting, accompanied by intense itching. After scratching, it is easy to break open and infected with pus. Long-term repeated stimulation is easy to form small nodules, moss-like changes. Treatment countermeasures 1, in the place of bites can be applied topical glycerine lotion to stop itching, if there is no at home, you can use floral water, anemone, cool oil, no-poisoning cream and so on. 2, if the redness and swelling is very strong, you can use 3% boric acid water cold compress, you can also use mineral water cold wet compress, time 10-15 minutes. 3, if the itching is very strong, then oral anti-allergy drugs, such as loratadine, cetirizine, paracetamol, etc.. 4, hormone ointment such as no cream, dermatitis and other good anti-inflammatory effect, can be used under the guidance of a doctor, the use of time can not be more than 2 weeks. 5, if the bites of the parts scratched, you can use Bactroban or fusidic acid ointment coated in the affected area, can play a role in preventing wound infection. 6, if the self-treatment is ineffective, timely to the hospital dermatology consultation. Precautions 1, do not go to the place where there are many mosquitoes in summer. 2, residence indoor and outdoor can be sprayed with insecticides, choose the right way to repel mosquitoes: mosquito nets, mosquito coils, anti-mosquito liquid. 3, avoid scratching the rash, so as to avoid secondary infection, scratches, scars, mossification, etc.. 4.Large lesions, severe itching, secondary infection, to seek medical attention. 5, patients usually pay more attention to diet, avoid stimulation of the onset of the site.