If it's hormonal and you want to avoid the roaccutane route, there is a fantastic supplement from the Advanced Nutrition Programme that is a natural treatment that is fantastic for treating acne.
I retail environ skincare alongside ANP and have great results treating acne. Their skin wash does contain sodium lauryl sulphate which is a foaming agent, and tends to be found in most washes. I would try him on something like that with a low level topical vitamin a like the environ moisturiser. Working with the supplements, results are good. The products also aren't flowery or perfumed. Another aggravant.
A lot if skincare advice is anecdotal. This worked for me/my friend etc. If you try the docs, there is a fairly standard route which is topical treatment such as mentioned above which is an extremely drying cream that contains bleach so avoid getting it on towels. This can give initial results but if unsuccessful, you often end up down the roaccutane route. If you don't know the effects of it, have a look at the programme "Dying for healthy skin". The side effects seem a lot worse for boys than girls.
It also comes down to money. Doctors is free but anything else you have to pay for!
Vic x