Insect bites cause skin redness, swelling, pain, consider the possibility of insect bites after the bite caused by insect bite dermatitis combined with infection, can be manifested as local redness, swelling, blisters, obvious itching, and even breakout with pain. At this time, you can take oral antihistamines, such as loratadine or levocetirizine hydrochloride tablets to combat allergies. If the redness is severe or accompanied by fever, oral antibiotics, such as amoxicillin or erythromycin capsules, can be taken at the same time for symptomatic anti-infection treatment. Local furacilin solution can be applied wet or topical Bactrim ointment to reduce inflammation and swelling. Avoid spicy, irritating or seafood foods that can aggravate the disease, and avoid local water washing and hot water scalding.