After a cockroach bite, you should first wash it with soapy water, and if there are symptoms of dermatitis, you can use and other medications to treat it. After being bitten by a cockroach, you should first wash the bitten area with running water or soapy water. Since cockroaches are also intermediate hosts for a variety of pathogenic microorganisms, after being bitten by them, they may cause dermatitis and allergic reactions. Erythema, papules, blisters and other manifestations may appear, and in severe cases may even cause swelling and pain. Clobetasol propionate application and mometasone furoate lotion can be used under doctor’s guidance to relieve the symptoms. If there are allergic symptoms, you can take antihistamines as prescribed by the doctor, such as ipecac hydrochloride tablets, chlorpheniramine maleate tablets and so on. It is recommended to keep your home hygienic, and if the cockroach bite is serious, you should seek medical treatment in time.