Hello,
Discoloration of the penis commonly occurs due to
bruise or
injury due to the zipper. You can apply Thrombophob gel (combination of
heparin & benzyl nicotinate) ointment in the area affected.
It reduces any
blood clots causing discolorations or darkening of the skin.
Such symptoms can also be indicative of STD. If you are sexually active & are having multiple partners you should visit ER, get physically examined & get STD tests done to stay on the safer side. You may need antibiotics/ antivirals.
Cancers of the penis are rare but it presents with skin discoloration, thickening of the penile skin, the penis goes sore.
Penile cancer usually doesn't hurt but may at a later stage.
Get examined & evaluated at the earliest. Early detection & diagnosis is important to start the treatment.
Hope I have answered your query. Let me know if I can assist you further.
Take care
Regards,
Dr Nupur K, General & Family Physician