Hello, I am a 37 year old male that has recently discovered two problems. Half of my navel is collapsed on one side. It s soft to the touch. I have also noticed a small lump about the size of a grape on the same side in my lower back above my hip bone, which feels like a muscle knot. Is this connected in some way or are they separate issues, and what is causing this? I also want to mention about 10 years ago I felt a hard lump smaller than a split pea near the surface of my thigh. I removed it myself and it looked just like a stone, perhaps calcium buildup, not sure if it factors in, in any way.