Suggest Treatment For Long Bump In My Hand

I'm 57, had a long narrow shape rise up on the inside of my arm between my elbow and wrist. It happened when I applied pressure and slide my thumb to the area from about 3" up towards my elbow. I rubbed it the other way and it went away I thought but it is now on the inside of my elbow, has two "bumps" but not the solid 1" protrusion like before. There also apper to be new veins or arteries developing around this area. I have controlled blood pressure and thyroid Hashimoto's.