Baby’s face breaking out. Advice?

Baby is almost 3 weeks old. Over the last week, he has started having little bumps come up on his face. They started under his eyes and are now on his forehead as well. They look like little pimples. His forehead is super dry as well. It seems to be worse when he gets hot and after his bath. Can I put lotion on his face? Could it be the soap even if he doesn’t have the spots anywhere else on his body? What could be the cause? How can I help heal it?