What Causes Itchy Rashes On The Back And Legs With Redness?

Over the last week I have been having itchy sections on my back and legs that come and go. I want to rule out lyme disease. I know you can get a bulls eye rash but want to make sure what I have is not from a tick bite. I did have a couple of what i thought were mosquito bites that went away , did not see any ticks on bite area but now I am paranoid. My brother in law just had lyme disease from mowing his lawn( had 2 bulls eye rashes on his leg and had to have antibiotics. My rash does not look anything like his, it almost looks like when you sweat and your skin gets pink and then it itches. Should I go see my primary doctor?