Since last week, my LO (1 month) started developing these small red pimples/bumps all around his forehead and scalp. I assumed it was either baby acne or heat rash, but now it's getting much worse. His face is covered completely with these red pimples as well as his neck and shoulders. He gets hot easily and it seems to get worse at night. Should I be too concerned? What's the difference between baby acne or heat rash? When baby acne/heat rash bad enough to call the ped?

Not sure what to do.