Had the same problem while in HS. You may be embarassed, but go to the dermatologist right away. Be your own advocate and tell them you want them to hit it with the strongest stuff. I didn't do this when I was 17 and had to suffer with a doctor who didn't take an aggressive approach.
They are too busy to tell you much, but always wear clean clothes, wash twice a day (especially while running), wash your sheets twice a week, and change your pillow case more often. If they feel you need Accutane, I would take it. If it really does have any bad effects on your health or running it takes 5 mos for the therapy and you will be done before outdoor track starts. Then you will be happier and not worrying about it anymore.