By Gary M. White, MD

Exogenous ochronosis is the formation of pigmentation of the skin where a high concentration of hydroquinone has been used.


The hydroquinone should be discontinued. Unfortunately, the pigmentation may be permanent.


Dermatologica Sinica March 2015; 33, Issue 1, Pages 29–30

EO arising from a de-pigmenting agent used for 7 years. Indian J Dermatol Venereol Leprol 2013;79:522-3

Exogenous Ochronosis. Indian J Dermatol 2015;60:537-43


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