baby rash?

Layna1006
I took her to the doctor and he said it was erythema toxicum ..pretty much just a baby rash that had to go away on its own..but when I looked that up it said it was mainly in new babies(she's 7 weeks) and that it would go away in a few weeks. Anyone have a baby with a rash like this ..did u do anything to help it go away or how long did it take to go away