Why is my tanned skin not getting back its original tone despite months of minimum sun exposure?

Hi! I used to have very fair skin tone back when i was a kid.Im very active in sports thus making my face and arm to tan very strongly . Unlike other people,the tan on my face and arm do not turn back to its original tone even after avoiding the sun for a long period of time. Im wondering why is this so? What can i do to have my original skin tone back? Will glutathione injection work for me? Thank you.

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