The redness and itchiness of an unidentified bug bite is considered to be due to inflammatory dermatosis caused by local allergies, which occurs in the summer and autumn. The symptoms of red, swollen and itchy local skin after insect bites are generally due to the fact that the insects will release toxins from their bodies into the body while biting the skin, and the body’s immune system will initiate protective mechanisms to release histamine proteins to counteract the foreign toxins. The severity of the redness, swelling and itchiness and whether it will cause a systemic allergic reaction are related to the type of bug that bites and the individual’s constitution. Just after the insect bite, you should carefully check for residual poisonous spines and other substances, you can first use a lot of water to rinse the local area, and if possible, you can use sodium chloride solution and other rinses, then use iodophor for routine disinfection, and apply local cool oil. At the same time, cold and wet compresses can accelerate the redness and swelling to subside. You can also apply topical glyburide lotion locally to relieve allergy symptoms, and pay attention to the need to shake well before use. If the local symptoms are serious, accompanied by dizziness, nausea and other systemic symptoms, it is recommended to seek medical attention in a timely manner to avoid delaying treatment. Dexamethasone sodium phosphate injection is often used clinically for people with severe insect bite symptoms, which can play an anti-allergic, anti-inflammatory and immunosuppressive role, improve the body’s tolerance to various toxins and reduce inflammatory reactions. For insect bites combined with infection can also use antibiotic drugs, such as cephalosporin and other drugs to give anti-infective treatment. In addition, there are more insects in summer, and it is best to wear long clothes and long pants in places with lush grass and trees to ensure that the skin is not exposed to avoid the re-emergence of insect bites. For people who need to work in an environment with more mosquitoes and insects, they should do a good job of mosquito prevention and apply flower lotion to effectively repel mosquitoes.