Mosquito bags hard and yellow water, may be caused by insect bite dermatitis, scratching induced infection, resulting in yellow water. Summer heat, often in and out of the external environment, such as parks, jungles, by mosquitoes and insects bite, toxins into the body resulting in edematous papules on the skin, which may cause significant itching, is a bug bite dermatitis. Insect bite dermatitis, may lead to localized pimples, bumps, blisters, also accompanied by obvious itching, itching. If you do not pay attention to skin care, often scratch the affected area, resulting in skin breakage, inducing bacterial infection, can appear yellow water. It is recommended to pay attention to the care of the affected area, such as the use of povidone-iodine to disinfect the local. The use of boric acid solution on the local wet compresses, can reduce exudation, but also with the doctor’s advice to give antibiotic ointment, such as fusidic acid cream, erythromycin ointment local application, can promote the inflammation subside. If the itching is obvious, you can follow the doctor’s advice to give oral antihistamines, such as cetirizine hydrochloride, loratadine, vitamin C, calcium carbonate tablets, can help relieve the symptoms. If the symptoms are severe, if necessary, go to the hospital dermatology department, under the guidance of the doctor.