There may also be difficulty in breathing and swallowing. The bite of a brown recluse causes a large spreading sore. This may be accompanied by fever , chills, a rash or red spots , nausea , vomiting , weakness, and painful joints. Tarantula bites usually produce only localized pain, swelling, redness, and itching . Sometimes they also cause a fever .
Any spider bite can easily become infected with bacteria.
Get treatment for persistent or spreading infection even if the spider is not of a type known to be poisonous. Symptoms your physician may observe Severe cases of black widow spider poisoning include fever , vomiting , delirium, convulsions, and paralysis . For the brown recluse the severest reaction may be localized around the bite. The venom causes the skin to die, creating first a blister and then a painful open ulcer that may take a long time to heal. The greatest danger from a tarantula bite is a possible allergy to the venom.