Suggest Treatment For Pain In Buttocks With Rashes

I have had pain in the right upper part of my buttox that eminates down and around to the front of my leg for two days now. This morning I also noticed a large bumpy rash that looks like small blisters. It is located where the pain began in my backside. The pain level is a 10 and I haven't slept in 2 nights because of it.