Hi Dr. Mintz, I m Amir. I noticed a lump on my penis, left side of the shaft, dorsal to the circumcision line. It s not tender, I haven t had any erection from this morning to see the lumps change due to erection, and it s diameter is roughly 1.5 to 2 centimeters. In touch, I notice a curvy or skein like collection of very thin elements like hair or something. Of note, I haven t had sex till now. I ll be glad to hear your advice and possible differential diagnosis.