A member asked:

How can hydroquinone turn skin darker and cause hyperpigmentation?

A doctor has provided 1 answer

Exogenous ochronosis: Higher strengths and persistent, sustained use of hydroquinone (eg 6 months or more) especially in darker skin types are risk factors for exogenous ochronosis. This results in brownish-yellow pigmented globules in the skin's collagen layers. Prevention is key by avoiding excessive use!

Answered 4/16/2016

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