Small lump on underside of penis shaft. Lymphocele? First I would like to state that I am clear of all stds and cancer. I kno this because my blood was checked recently for an array of things because of unrelated issues. After a vigorous masturbation session the next Morning I noticed a small pea sized lump on the underside of my penis about mid shaft. It doesn t really hurt unless I mess with it. It is attached to the skin and is not moveable. I can lift the skin up off of my penis and it seems to lot be connected in any way to the actual meat, just the skin. Lymphocele possibly? Also I cannot just wait for this to go away on its own. Would it be safe to sterilize the area and drain it with a sterile needle/syringe? Thanking you now for your answers.