What Causes Lipoma Around Rib Cage And Blood In Stool?

It s a bit complicated. Three doctors have told me that I have a lipoma around my rib cage. I feel that it s getting bigger and wrapping towards my belly button, so it starts on the right rib cage side and it s developing like a snake and making it s way left. Weird. I ve also had a little blood in my stool. Doctors tell me not to worry.