I had the same issue when I was your age. I ended up getting proactiv. It works. If that doesn't work - talk to your doctor. There are prescription skin medicines that are topical so they would not upset your guts.
Crohn's Disease - 29 years
Diagnosed at age 10 in 1979
1st ileosecal resection 1989
2nd colon resection 1993
Chronic "D" and arthritis
Chronic rectal stricture with colonoscopy every 3 months to dialate
Insomnia since 1980 - I love my ambien!
SCUBA diver, Master's degree student, college graduate, Pet therapist