Its really small, about the size of a pea. You can't see but it can be felt. I don't recall every having a needle in that arm, although I could be wrong. Its near to my shoulder but there isn't a lump on the other arm.
Is it something worth bothering the Dr about or am I just being a complete wimp? It makes me cringe when I touch it. I know I'l probably be told not to touch it then but I worry about any lump.