Exogenous ochronosis--a diagnostic challenge.

Abstract

Exogenous ochronosis has been reported worldwide following long-term application of skin-lightening creams that contain hydroquinone, phenol or resorcinol. This report documents six patients presenting in Singapore with greatly differing facial dyschromias and discusses the diagnostic difficulties. 
DOI: 10.1111/j.1473-2165.2010.00529.x

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