Pad rash postpartum

So I had switched to overnight pads after getting home from the hospital and wore those for maybe a week and a half only at night. Then I noticed I had started breaking out on my butt so I stopped using them altogether and just wore a regular pad. I’m now 6 weeks postpartum and I still have the breakout, but I’ve not been wearing anything but underwear. Has anyone experienced this? What do you use for it?