are you certain it is just a rash? Like a heat rash? Try Gold Bond medicated powder. You can find it in the aisle with foot powder and such.

There a bit of brown discoloration and it itches a bit. Anything else you would recommend to make it go away asap?

Thanks

did you try Gold Bond? it works for me to keep moisture away and relives the itching.

How can I tell if its not a rash?

see a doctor