When I was 15 I had pretty bad cystic acne on my forehead, and only my forehead. I tried epiduo like my dermatologist recommended, but it didn't seem to make much of a difference. I originally started drinking enough water because I downloaded an app called plant nanny, and I wanted to compete with my friends. Thank god for this because in two weeks that acne was significantly better and within a month and a half it was completely clear. And I mean COMPLETELY. For the next year and a half I was
I used epiduo for a while when I was 15 too and also for acne that only affected my forehead. Although, my acne was much more severe than yours (large, inflamed cysts). It didn't actually make a difference though. I didn't notice it getting worse or better, so I think it's definitely worth a shot, and if it gets worse just stop using it.