In the inside of my bicep (left side of my right arm) i have a vein like bump. It's not so much like a bump, but more of a vein feeling (but its not a vein). You could only see it sometimes if im flexing or my skin is stretched. I only feel pain when i press on it with my finger. its pretty small, nothing like a bump you notice unless i try to get it to be shown.
does anyone have a clue as to what this is?