The thing with spider bites, even if they are from spiders that are not particularly dangerous, is, they get infected very easily. Many of them are infested with staph and it gets in the wound and causes a serious infection. If it is red and inflamed, painful, and swollen you have no time to waste. See a Dr. right away. I nearly lost a finger in less than 3 days after being bit. The infection was that serious. The spider was not dangerous, and the venom mild, but the infection... OMG. The finger had to be cut wide open, kept open, and packed with iodine strips twice daily. Not fun.