Anything with that Salicylic Acid in it. Dial has a bar soap that we use sometimes. There are several products for "bumpy skin" too.
It depends on the cause of the acne.
Our pediatrician said our girls was due to too much Keritin building up in the pores. Then when it's not cleaned off it gets hard on top, makes a white head, and then it gets inflamed due to more being produced. So it gets red and irritated and sore.
The research I did helped us to make a plan. She washes her face each day and gently exfoliates her skin by using the Salicylic Acid product. THEN, THEN, THEN the skin has to have tons of moisture. We used Coconut Oil for a while but when she would give me a hug or sit by me my face would itch. She uses a different moisturizer now.
If the skin is cleaned but doesn't get a layer of moisture on it it makes it worse. If it's not exfoliated when it's cleaned then the pores don't get unplugged up and they get even more irritation and stuff.
Please check with the pediatrician and then do your own research. You can also take him to a dermatologist but even doing some research on your own will help you find a lot of information.