After being bitten by small black insects, you should promptly use soapy water or baking soda, in the local area for adequate rinsing, and then use iodine volts in the local area for disinfection, when the dermatitis symptoms caused by small black insect bites, you can take cefixime, chlorotetracycline or amoxicillin, clavulanate potassium for anti-inflammatory treatment. If the skin is itchy, you can use compounded glycerite lotion to stop the itching. If there are symptoms such as pimples or windmills or erythema, you can drink some Jinhuang Tang, Ephedra and forsythia or Xiaodou Tang to treat it appropriately, and if there is an infection, use a wet compress with a decoction of horse-teeth water pipe. During this period, we should pay attention to more water, can not eat spicy, stimulating food, such as chili, pepper, mutton, beef, coffee, strong tea, etc., if the localization is scratched when the symptom of pus will appear, must go to the hospital in a timely manner for treatment, do not use drugs privately, otherwise it may lead to serious skin ulcers, it is recommended that during the period of treatment, we should keep the localization clean and dry, do not get wet, or else it is easy to occur Bacterial infection and inflammation.