Rash!?

Amber

My son will be 7 weeks old tomorrow and got this rash on his face after his bath tonight. He and I took a bath together tonight seems that the only way he enjoys bathing. This was the side of his face that was up against my breast. Anyone know if it’s just heat rash, allergic to something, or something else? He seems to get rashes on his face often. I’m not sure if I should be worried. He has very sensitive skin, worse than my other 3 kids.