I Am Pretty Sure I Was Bitten By A Brown

I am pretty sure I was bitten by a brown recluse about 4 days ago. I woke up Saturday morning with a small dark purple circle on my arm, surrounded by red rash about two inches wide. Later that day, I broke out in hives on my back, stomach, in between my legs and on the bottom part of my arms. I took Benadryl thinking I had a allergic reaction and that seemed to help. Now 4 days later, the spot has not gotten bigger but here is a small white dot in the middle but the redness around it comes and goes. I have been taking Benadryl, ibuprofen and icing it. I am just worried that it could get worse.