Can you give more details please/
- Where exxactly is the spot? Since when have you noticed it?
- How large is it? Any itching, pain?
- Colour of the spot?
Have you uploaded a photo? I can't see one.
This looks like a condition known as Lentiginosis of Penis . This is a condition in which pigmented areas may appear on the body and shaft of the penis. The cause is not known.
There is usually no other symptom - no itching, pain, ulceration etc.
The condition may fade spontaneously over time. It may also remain as it is without causing any problem.
Lentiginosis needs to be differentiated from a melanoma with a skin biopsy , so you will need to consult a dermatologist about it.
There is no specific treatment.
I hope this helps.
Please let me know if you need more information. If not, please click on a positive rating to leave feedback.
The GP should be able to give you a diagnosis. If not, he/she will refer you to a dermatologist.