Difficult options: POH is difficult to treat. See https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4756872/ options include topical depigmenting agents, such as hydroquinone, kojic acid, azelaic acid, topical retinoic acid, and physical therapies, including chemical peels, surgical corrections, and laser therapy, most of which are tried scientifically for melasma, another common condition of hyperpigmentation.
Answered 3/26/2017
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