I would not hesitate to get it ck'd by a doctor.
DH was bitten on his finger last year, by what we think was a spider. He never saw it, so we are not positive. We live in a wooded area and black widows are very common around logs, etc. which he was using. There was never any pain, at first just minor swelling.
As a precaution, I suggested he use peroxide warm soak, vit E and neosporin. A few days later it really started to swell up into his hand and I convinced him to get it ck'd. The dr also felt it was a spider bite, as in the center you could see tiny markings, so put him on an anitibotic. We continued to soak it several times a day (dr recommended peroxide), use neosporin, Vit E and kept it wrapped.
After a week it started to drain. Another re-ck by the dr and thankfully by third week he was good to go. We have 2 friends who were bitten by recluse spiders and we are talking serious business and major health problems there.