After being bitten by cockroaches, you should first wash your skin under running water or use soapy water to clean it, and then treat the skin lesions accordingly. Cockroach bites can easily cause insect bite dermatitis, with clinical manifestations such as erythema, papules and blisters on the bite site, and can also cause swelling, pain and itching of the affected limbs or torso. Cockroaches are intermediate hosts for a variety of pathogenic microorganisms, and their feces and body fluids can easily cause allergic reactions. Those with mild symptoms can apply topical glucocorticoid creams, such as clobetasol propionate cream and mometasone furoate cream, and take oral antihistamines, such as iproniazid and chlorpheniramine. Those with extensive skin lesions and severe allergic reactions can take oral glucocorticoids such as prednisone and hydrocortisone for a short period of time as prescribed by the doctor. If itching and pain are obvious, you can also use a clean towel wrapped in ice, or you can apply topical medications such as glyburide lotion or antipruritic cream. The damaged skin is prone to secondary bacterial infections, and if there is septicemia and other infectious manifestations, antibiotics such as cefradine can be applied under the guidance of a doctor for treatment as appropriate. Cockroach contact or bite food at home can also cause acute gastroenteritis, as well as the spread of parasitic eggs and various intestinal diseases. Therefore, cockroach prevention and control is very important to maintain a hygienic home environment, remove discarded debris and garbage, and can assist in using some physical or chemical cockroach control items, such as cockroach paper or cockroach control drugs.