Can depiwhite and differin be used together? (Photo)

I have been using differin for about 3weeks now. I also suffer from hyperpigmentation on my chin which has recently darkened and I have fair (Asian) skin tone. My doctor had prescribed depiwhite a few years ago but I discontinued it. I was wondering if it is safe to use the two at the same time if yes please advise how and when should they be applied for best results.

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