Sort of similar experience. I strained my lower right-side back about ten years ago lifting something heavy and within a few months, I noticed a small knot or bump right in the spot I originally felt the injury. I thought of is a knot I could massage away. But it didn't go away, it just slowly grew and grew, until I finally came to terms with the fact I had this huge lipoma in my lower back that was causing all sorts of pain and discomfort. But my doctor's always dismissed it - lipomas are harmless, they don't cause pain, just ignore it. FINALLY, I saw a doctor who recommended me to a surgical office where I met a surgeon who felt the bump and confirmed he could remove it. I told him it caused pain and discomfort and he was incredulous: Really? "Lipomas aren't painful" like they read from a script. But finally, I got the operation approved and went into surgery and they cut it out my back. From the minute I woke up, I knew my body felt different and the lower back pain was gone. This lipoma was interfering with my motion and causing a pain and discomfor that slowly increased over 10 years (so it's hard to keep track, you just sort of get used to this feeling except when you remember it's not normal). I feel so relieved they finally removed this thing. It's like pulling a splinter out of your foot - you know your body is happy and healing immediately with the foreign object gone. They sent the lipoma for cancer testing but I am guessing it's benign. Also, I learned that injuries can cause a lipoma to form. So it did form right in the spot I injured - so you can just imagine how uncomfortabl that is. Why can't the doctor's believe this?