I felt a strange sensation emanating from my left elbow area. Thought I had a bug crawling on my skin but there was none. As I felt around the elbow, I noticed a small lump, pea size, on the ulna bone. I have a fatty tumor on the inside of that same elbow which is about the size of half a golf ball. I went to see my oncologist whose care I am under since I was diagnosed with uveal melanoma and had eye enucleation almost 4 years ago. He is just watching the fatty tumor and not concerned about it. The tingling or insect crawling on my arm is occurring more and more frequently. Should I be concerned?