Baby Acne

Hello mamas! I'm a first time mom and am having a hard time trying to figure out if my little 2 1/2 week old daughter has bad heat rash or baby acne on her face. 
Wondering how to treat this condition or if I just have to let it run its course? Perhaps it's something I'm eating? I've also heard my hormones might be causing this. 
If you have any experience in this department, please let me know! Thank you!