2 doctors weighed in:

Small hard lump under the skin of my penis that isnt visible unless you look thuroughly and doesn't hurt unless squeezed. What could this be?

2 doctors weighed in
Dr. Simon Kimm
Urology
1 doctor agrees

In brief: A few things,

But the most likely cause is a sebaceous cyst.
These are benign skin lumps filled with keratin and fluid. They can be stable, or enlarge and get inflamed, and sometimes drain on their own. If you have a painful, inflamed, or enlarging lesion on the penis, see your physician for evaluation. Many other benign skin issues also present as lumps.

In brief: A few things,

But the most likely cause is a sebaceous cyst.
These are benign skin lumps filled with keratin and fluid. They can be stable, or enlarge and get inflamed, and sometimes drain on their own. If you have a painful, inflamed, or enlarging lesion on the penis, see your physician for evaluation. Many other benign skin issues also present as lumps.
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