I was bit by an unknown spider 6 days ago. I didn't even feel the bite. I thought it was just a few mosquito bites. Its definitely only one bite but was red and swollen to the size of a sand dollar. I've been keeping ice on it and taking benedryl as well as putting antibiotic cream on to prevent infection. It doesn't hurt anymore, it just itches at night time, the swelling has gone down by about half but it's still swollen. How long will it take to heal?