My baby had baby acne and mustela no rinse cleansing water cleared it up. I use it 3 times a day and don’t use any creams on her face for now. I find creams and oils clog up her pores more. After doing this for 3 days it cleared up.
My baby had bad acne on face and chest for 3-4 weeks and I was not putting anything on as remembered the midwives saying not to use products for the first few weeks. Then I started to simply clean his face with Johnson's baby lotion and moisturize it with Aveeno sensitive skin cream and it went within the space of 3 days!
Putting breastmilk cleared my baby's acne, it cleared within 2 weeks or so
Does your baby have any other symptoms? I thought my baby had baby acne but it turned out to be cmpa, not to worry you I’m sure it’s not! But just keep an eye on it as a rash for so long can be a sign of it. Common symptoms of cmpa are reflux/ lots of spit ups, fussiness, constipation or diarrhoea. Hope you get to the bottom of it for little one xx