On longer rides on my recumbent I've noticed the day after the ride my back breaks out with numerous small acne like white heads. They are completely gone about a week after the ride. These pimples seem to match up with the top edge and sides of the seat, not in the middle of my back.

I went to a dermatologist and he described the condition as "mechanical acne" caused by rubbing sweaty skin. He said foot ball players get this from their helmet straps. He didn't really have any advice other than he could prescribe an anti-biotic to take several days before a ride but I don't like the idea of taking anti-biotics, especially for a cosmetic condition though it does look really bad when it happens.

I started to apply Body Glide before long rides to try to reduce the friction. It seems to have helped somewhat but the acne still appears the day after a long ride, just not as much.

Has anyone else had this recumbent riding induced back condition? Any advice?