i was bit by a spider or something, 4-5 days ago and it got a white head thinking a pimple, its on my upper arm by my elbo it is very red swollen a bit , hurts bad with burning in it, and hard in middle of this thing, my husband had mersa was in hospital and came home with iv meds, and my 1 son recently had a boil and pus with it also so been around both soreness follows down to the elbo and big area of it, and i have auto immune disease also, i been applying hot packs to it, and some puss came out, now it keeps draining , should i seek medical on it or just keep doing what i am, it real sore a red in big area of it please let me know