Bug bites have been itchy considering the insect bite dermatitis, the treatment is generally divided into external drug treatment, oral drug treatment. Inflammatory skin reaction caused by insect bites skin, the general patient manifested as red skin wind ball-like changes, redness, swelling, blisters, can also appear papular urticaria-like changes. Topical medication: local topical glycerite lotion to help astringent, anti-itch, hydrocortisone butyrate ointment or dianabed ointment and other glucocorticoid creams to help anti-inflammatory and anti-itch. Oral drug treatment: if the effect of external drug treatment is not satisfactory, oral antihistamines such as loratadine tablets, cetirizine tablets, etc. can be anti-allergic reaction; antibiotic drugs such as mupirocin ointment, etc. is suitable for the skin breakage after scratching, secondary bacterial infection; prednisone tablets and other glucocorticosteroids are generally applicable to the patients with serious conditions. If the patient appears after the insect bite itching, the condition is more serious, it is recommended to hospital dermatology, identify the cause of the disease, and follow the doctor’s instructions for treatment.