Just keep an eye on it, if it gets worse or the discomfort spreads then maybe have it looked at. You say it seems connected with your bowel movements, and also that you're having acupuncture (is IBS one of the issues being treated by the acupuncture?) - so it wouldn't be unheard of to have discomfort around your abdomen in that case. Having said that, I've never had acupuncture so I'm just speculating here. I think you should just listen to your body and follow your intuition - deep down I think you probably would have been off to the doctor by now if you believed it was something sinister. Keep going with the good diet and try to get some exercise (by the way, walking is good for the lymphatics too if you can't get a rebounder - the lymph system has no pump, it relies on muscle movement mainly in the limbs), that's important because a healing reaction will just last that much longer if there are more toxins being dumped into the system.