Yes, I have dealt with lipoma. I have several on my right leg. I also have a one on my left leg, but it isn't really noticeable. I went to a surgeon six years ago about it, because my mother was obsessed it was possibly cancer. The surgeon told me not to worry about it - he told me that since the tumors weren't "hard" and weren't causing any pain, I shouldn't be concerned. Ever since I started do some serious jogging and weightlifting, these tumors have been 'pushed' to the surface, and are much more noticeable now than they were six years before.
A friend of my mother, did however have a bad experience with lipoma. Her husband had lipomatic tissue on his right thigh that he had for years, and his MD also told him not to worry about it - he noticed the lipomatic tissue when he was in his 20s. When he got into this mid-40s, he noticed that the 'tumor' on his leg "hardened." When he went to the MD to talk about it, the specialist his MD sent him to told him that he had cancer... and that there was nothing he could do since the cancer had already metastasized. He died about a month later.
When I went to the MD six years ago, he told me that if I wanted to, I could have them surgically removed, however the invasive procedure would scar my leg, and "unnecessarily" interfere with the muscle tissue and tendons. In short, if cancer is my ultimate fate, I don't see what else I can do but be vigilant since I have a multitude of them on leg... and I probably have more that are hidden deeper in muscle/organ tissue. My mother is now starting to shift her omnipresent concern to my sister since she has lipomatic tissue on her back, but her respective tumor has hardened in recent months.
EDIT: I would like to add that I wasn't taking protein supplements 6 years ago when I noticed the lipomatic tumor on my leg. I was told to be mindful of them though since I have a family history (paternal and maternal sides) of breast, lung, skin, brain, and kidney cancer. I think I may be ok at the moment though. People in my family tend to get cancer really early or really late in life. I think since I managed to make it into my mid-20s, I should be ok until I hit my 70s-80s. I hope I didn't terrify you, but I am being completely honest about my experience with lipoma.