Hydroxyphenoxy Propionic Acid for brown spots, will it work? (photo)

I tried off and on to use hydroquinone for years but develop rashes. I recently found out from my doctor that it is because it is sulfa based - I'm allergic to sulfa. I also have rosacea. I alternate using 0.025 skin medica retinol and an AHA , IPL, Vitalize peels. I also use 32 SPF sunscreen daily. Is there ANY type of non-hydroquinone non- sulfa lightening cream available that is acceptable?

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