I have something hard that just showed up under the skin of my penis. It's worm-shaped, about an inch long and 1/4" thick. It's located right under the head and wraps around. It isn't painful and seems to be partly detached from both the skin and shaft as I can move around part of it. The rest seems to be attached. An STD should be ruled out as I've been with the same girl for 3 yrs and we both had tests prior to sleeping with each other. This lump is big enough to notice whether soft or erect. Please help me!