Thinking I got bit by a spider 4 days ago its really red and swollen I cant seem to get the swelling down aroung the bite it just turned purple?

INFECTION? Hot, red, swollen, painful are signs of infection. Also, perhaps a local allergic or toxic type reaction to the bite itself. Sometimes they can form a tiny abscess which MAY, not always, need to be drained. If you do not have a primary doctor , should go to the ER; a doctor should actually look at it and feel it to decide. Good luck.