When the human body is bitten by bugs, it can lead to localized skin redness, swelling, heat, pain, allergy and even infection. After being bitten by black bugs, the following options are mainly used for relief: 1. Rinse the skin surface with flowing water, apply alkaline soap to the wound surface and rinse repeatedly. 2. You can apply topical aloe vera gel or aloe vera juice, or stovepipe lotion to the surface of the bitten skin to relieve the itching sensation. 3. Topical corticosteroid treatment, such as compound flumethasone ointment, enbrel cream, compound clobetasol propionate 4, if there is chest tightness, breathlessness or dizziness, you should promptly go to the hospital, you can inject dexamethasone injection or epinephrine, or oral glucocorticoid treatment, such as prednisone acetate tablets and so on.