Reverse Vitiligo; why is my skin depigmenting? (Photos)

I am a very fair completion caucasian female and was using Hydroquinone 4%. Prior to May of this year I had gotten rid of my "dark/tan" spots. In May I started getting tan spots again from my wrists to mid-arm and on my lower legs. My derm. Dr. Amy Mason changed the strength to 8%. I have 2 issues: Why is my skin depigmenting? Compound pharmacies no longer can get hydroquinone? Please help!

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