I was bitten 10 days ago, by what I believe to be two spiders. The bites have got worse as the days have gone on- as in even more itchy and swollen. I've even started getting a little bit of a rash below the bite that is very itchy. I believe they were tiny zebra spiders, but I can't be 100% sure. I brushed them off pretty quick! They definitely weren't mosquitoes. Do I need a trip to the docs??