I have hyperpigmentation around my mouth for ten years, is this curable?

I have hyperpigmentation around my mouth, it there for almost ten years now, don’t know what needs be done.
I don’t want to user hydroquinone , carticosteriods, and chemical peels as I have already tried them and every time it keeps coming back.
And I usually don’t go out in sun from past few years.
Please let me know is this curable.

hyperpigmentation





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