I don't know: That is a very good question that I often wonder, being prone to post inflamatory hyperpigmentation myself. I wish we know. I wish anybody knows! Use twice the amount use twice as often? For how long? How come it works on one spot and not on another? I know sun exposure makes things worse, the rest,??? IDK! Aslo I worry about effects on the cornea applying too close to the eyes.
Answered 3/26/2017
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