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Thanks. Going from the details that you have provided, it seems that you have repeated maceration of skin which has also led to discoloration.
There is no way to completely return back to original color. Only thing is that any further darkening can be prevented by controlling the weight, preventing sogging of the inner garments, providing fresh air as much as possible like not using the inner garments at night and do with just a gown, preventing scratching, and by applying soothing lotion like calamine.