My son had baby acne as well, but I was told not to put anything on it - just keep the area clean (do not overwash, as that can cause irritation, and do not scrub because that can also aggravate the issue). I just washed his face gently with water once or twice a day. He is almost 5 mo now and no longer has any issues.
I think it's normal, it's just the baby's reaction to the lack of maternal hormones.