rash?

Kelli • My wife and I got married in March 2015. We had our first baby together may 25 2016. We are trying for baby number 3!
So I found this on my son the other day. They don't bother him but i just don't know what it is. He doesn't seem to touch them. It's only right there on his arm. Dr didn't seem too concerned. He goes back to the dr Friday.