The black widow spider’s bite produces shooting pain and appears as two dots produced by their fangs. Nausea, increased blood circulation pressure, and vomiting occur soon after and certainly will require immediate medical attention. The brown recluse spider bite is painless, but may still be extremely serious. The bites in many cases are red, then white, and also have blisters by means of a bullseye. These bites require also immediate medical help, as a big ulcer can develop in the skin.