Cockroaches, if not serious, generally no adverse reactions; some people may cause allergic dermatitis, insect bite dermatitis and so on. 1. No adverse reaction: If you are only slightly injured by cockroaches and your immunity is relatively strong, it will not cause any adverse reaction. 2. Allergic dermatitis: If you are allergic to cockroaches, being staked may cause allergic dermatitis, resulting in itching and red rashes. 3. Insect-bite dermatitis: After being bitten by cockroaches, insect-bite rash is likely to be induced, resulting in localized doughnut-like pimples, accompanied by burning, stinging, itching and other symptoms. Currently there are stung by cockroaches, in order to prevent secondary infection, the wound should be scrubbed with iodophor or sterilized alcohol as soon as possible, and topical erythromycin ointment and mupirocin ointment should be applied. When there is an allergic reaction, you can take oral loratadine, cetirizine and so on. The use of medication should be under the guidance of a doctor.