DARRELL PERRY / SCIENCE PHOTO LIBRARY DARRELL PERRY / SCIENCE PHOTO LIBRARY
Close-up of the lower back and intergluteal cleft of a 50-year-old African-American man, showing heat rash. Fox-Fordyce disease, or apocrine miliaria, is a chronic blockage of the sweat gland ducts with a secondary, non-bacterial inflammatory response to the secretions and cellular debris in the cysts. Also in view is three-year-old scarring from mosquito bites.
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