The arm was bitten and swollen, if there is no bleeding can be treated with medication, hot or ice packs to reduce swelling, bleeding, you can also apply antibiotics to prevent infection. 1. No bleeding: within 24 hours you can apply cold compresses, which will help to reduce swelling to a certain extent. You can also use safflower oil, Yunnan Baiyao aerosol and other medications to promote swelling. 24 hours later, hot compresses should be applied to accelerate blood circulation to achieve the effect of swelling. 2. Bleeding: If there is a wound or infection at the place of the bite, there will be local fever, pain and other symptoms. Need to regularly disinfect the wound, make the wound dry, clean, with the control of inflammation, the local lump will also slowly disappear. And take amoxicillin, cefaclor and other antibiotic treatment. But it should be noted that if the bite is a confirmed rabies patient, then you need to inject rabies vaccine or rabies immune globulin within 24 hours.