Wow- my son was on anitbiotics for acne in high school. A few weeks before he started with the bloody stools that was eventually diagnosed as Crohn's he had his wisdom teeth out and was on anitbiotics because he developed an infection. I always thought there was a correlation between having the teeth out and the flare up but never realized it could have gone back to the treatment for his acne. I feel horrible. I pushed him to go to the dermatologist and that could be what has caused all of his pain.