Dark armpits by using Hydroquinone 4%. What should I do now? (Photo)

my armpits are dark bcoz of acanthosis .. i lost weight and used xtreme brite gel it worked. but later on i put weight on and its dark now .. i cannot buy that cream again as its not available here so i read about hydroquione 4% . i using it now .i used it four days didnt feel burn but after that my skin started burning and they got darker ..so what should i do now ( leave it or keep using it for 3 to 4 weeks) ?

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