Baby Acne or Milk Allergy??

A few weeks ago I noticed little bumps on his forehead. Everyone told me these were normal. He is now a month, and the bumps spread down to his cheeks, neck, and now body. We went from bathing once a week to every other day, switch body wash and lotion, and switched to hypoallergenic formula for two days only. But no difference just now some areas are drying out. He has a doctors appointment on Saturday. But I would like to learn more of any possibilities that this can be before consulting with his doctor. Also, because I’m a first time mom and feel really bad for not knowing what this could be after doing so much research. Is this really bad baby acne or milk allergy? Or something else? Should of I used the hypoallergenic formula more than two days? Anything would help Thank you!