Is it possible to get back the complexion of my penis that became dark due to using a cream?

Hi, My complexion is different than that of my penis. the complexion got dark as I once used a cream 22 years back to get rid of itching. it is evident that it was happened as part of side effect caused by that cream just after using it for 7 days. Neither i can find that cream nor I can remember the chemical composition of that cream. So, kindly mention what should i do to get back the complexion of my penis & other private areas. thanks much in advance.

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