Hello - thanks for asking your question.
Without seeing the lesion it is impossible to say what it is.
One consideration may be
PeyronieCurvature of the penis's disease.
PeyronieCurvature of the penis's disease, a condition of uncertain cause, is characterized by a plaque, or hard lump, that forms on the penis. The plaque develops on the upper or lower side of the penis in layers containing erectile tissue. It begins as a localized inflammation and can develop into a hardened scar. It occurs in 1 percent of all men. The plaque itself is benign, or noncancerous.
However, any new mass needs to be evaluated for possible cancer. I would see your physician or urologist to have this looked at. The definitive test to see what it is would be a biopsy - but this should be considered after being evaluated by a physician.
Followup with your personal physician is essential.
This answer is not intended as and does not substitute for medical advice - the information presented is for patient education only. Please see your personal physician for further evaluation of your individual case.
Thanks,
Kevin, M.D.