Try Cortisone cream you can buy over the counter. and see a Dermatologist!
Did you have any other symptoms?
(headache, fluish feeling?)--even before the rash?
Has there been only those spots are there others?
The rash needs to be seen up close. Is it moist and fading?
Is there any pustules?
It may be a fungus.(you can catch that on gym equiptment etc...)
It can be a LOT of things but its too hard to tell with out a really up close picture and even then it can be hard to diagnose. (of course we are not doctors).
Thanks, now I have to lookup up how to treat it
sounds like eczema to me!