Bug bites skin redness and swelling is generally insect bite dermatitis, the main use of medication, such as glucocorticoids, antihistamines and so on. Insect bite dermatitis is mainly caused by mites, mosquitoes, fleas and other insect bites, local bites, skin redness and swelling, itching is severe, for the less severe symptoms can be local topical glucocorticosteroid cream, such as compound dexamethasone cream, floride ointment, etc., oral antihistamine drugs, such as loratadine, ibuprostone, etc., skin lesions generalized, allergy is serious you can take glucocorticosteroids, such as prednisone and so on. Insect bite dermatitis should be treated in time, under the guidance of the doctor to use drugs.