call OB or general practitioner?

Megan • TTC #2!
so in the last 24 hrs I've developed yet another itchy rash- I want to get it checked out ASAP, for me rashes are always a red flag symptom.I'm 4 weeks postpartum and don't know whether I should call my OB or regular doctor! I had PUPPP that I am *just* getting over, this looks very different so I'm pretty confident it's not that.Which dr would you call?