Afraid to wear a swim suit because of back zits?

I used to have acne on my face and that is gone now and has been for years.
But I still have zits on my back. Enough to make me insecure to not wear a swim suit. I am going to the dermatologist next month but in he mean time I'd like to go swimming. I don't want people to think I look gross though.
I shower regularly and exfoliate my skin. I also run a lot and I sweat a lot. I shower directly after I finish running.
Help?
Afraid to wear a swim suit because of back zits?
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