My son has been suffering of back acne known as “bacne”. I did some research online and found what I hope will be a solution. 

Here is the advice I found: Use dandruff shampoo daily for one to two weeks, then twice weekly for maintenance. Let it sit on the skin for a few minutes before rinsing, so it has enough time to penetrate the hair follicle. 

I found a Youtube video that discusses alot of other acne related topics, but she does talk about the back acne towards the end. I found this helpful.

I hope to report good results in a week or two. We ended up getting this shampoo as recommended.

Ligia