Vegan eating is really, really good. I've been on it for about 2.5 weeks now, and I have already seen a significant difference in how my digestive system works. I'd also been battling IBS, insomnia and hot flashes. All have been drastically reduced.
For skin lipomas, I read that a clean diet can go a long way in getting rid of them as well as preventing new lumps from forming.
I hope your colon lipoma shrinks - glad it's been diagnosed as being benign. Good luck!