I have lipomas all over my body. Several in my right arm, several in my back, and several in my upper legs (mostly right leg). What are yours like? Do they cause pain or discomfort? Can you grab them and move them around a bit? Because that's typically a lipoma. I've read about STC's as well, and from what I can tell, they're typically seated fairly deep. And they'll grow larger fairly quickly, or at least with time. Mine have hardly changed at all in the 6 or so years that I've discovered them. Most of them can't be seen, but only felt. Look up lipomas, they're benign fatty tumors. I mean, I haven't had mine officially diagnosed, but the logical part of my brain believes it's safe to assume that that's what they are, because in 6 or so years, my health hasn't changed.