J Dermatol Case Rep 2015 Jun 30;9(2):42-5. Epub 2015 Jun 30.
Department of Dermatopathology, Razi Hospital, Tehran University of Medical Sciences, Iran; ; Department of Pathology, Cancer Institute, Imam Khomeini Hospital Complex, Tehran University of Medical Sciences, Tehran, Iran.
Background: Colloid milium is a rare cutaneous deposition disorder characterized by translucent papules developing on sun-exposed regions such as the face, neck and dorsal aspects of the hands and back. Exogenous ochronosis is caused by the accumulation of homogentisic acid resulting from long-term application of certain topical agents. Histology is characterized by yellow-brown pigment deposits in the papillary dermis. Read More