Epidermal Cyst on Penis

Q. I have a burrow-like opening on the shaft of my penis, and inside is a seed-like object. What is this?

A. Of course I can’t be sure what you have without examining you personally. You should certainly see a doctor to find out exactly what you have. From your description, however, a possible explanation is that you have an epidermal cyst. This is the most common type of cyst (fluid-filled growth) found on the body. These cysts are commonly found on the scrotum and, less frequently, on the shaft of the penis.