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From the description given by you, the spots are most likely to be patches due to pigmentation which most commonly occurs due to chronic irritation by Smegma
. There is no cause of concern as the lesion is flat and not associated with any other symptoms like itching or congestion.
If you are not circumscribed, I would suggest you to maintain good hygiene which includes retraction of skin of glans
that is prepuce and washing it thoroughly with plain water twice a day.
I hope I have cleared your doubt, in case you have any further query you can get back to me with a clinical photo.
Wishing you a healthy life.
Dr Deepak Kishore