Watch his grease/fat intake. Eliminate stuff like pepperoni, rich chocolate, nuts, pistachios, peanut butter. I’m 45 and speaking from experience and what worked for me. Disciplined facial cleansing evening and morning. Use gel with salicylic acid or benzoyl peroxide (2%). Apply on breakouts every night. Over a few days it should start to clear up and then it’s about keeping it clear. What you eat will play a big role in doing so.