Question: I have a hardish moveable, bee bee size mass at the base of my penis on the under side. It feels like it is connected to some tissue from below. I can't tell if it has grown. At first I thought it might be a small lymph node but I've been reading online about some people who suspected cysts. I am a medical student studying for step 1 so it's the last thing I want to think about but it's been bugging me and our student insurance is like 3 weeks out hmo style. I'm trying to determine if it's something worth getting checked or if I should wait and see if it grows. I can't seem to find a differential on up to date.

Thank for you detailed response! I would post a picture but im not sure how to take one because its not on the surface. I felt it again while standing and compared both sides of he spongiosum underside maybe 2 cm distal from the origen of the penis. You have to move the testicles out of the way and if you take your index finger and roll against the surface of the spongiosum palpating through the skin (actually palpating the surface of the sponiosum) it feels like a little groth or barnacle growing on the spongiosum surface or possible growing out of the connective tissue that tightly surrounds, or venous plexus. I can invision a thrombosed vein thats running on the superficial structure or possibly a cyst as you said. I have been sitting a lot with all the studying. Just wanted to clarify that it was not on the surface or free moving in the scrotum but actually growing on the structure of the penis itself. Not sure if that changes your thoughts at all. Thanks again!