Miliaria Crystallina on Skin Physical Examination



A 55-year-old man who had been admitted to the intensive care unit had a sudden-onset vesicular rash across his trunk and arms. On examination, clear vesicles resembling water droplets that did not rupture with light palpation were seen across his torso.



This is a mild form of heat rash caused by 



The mildest form of heat rash is called miliaria crystallina. This is caused by occluded eccrine sweat glands on the surface of the skin, marked by tiny, fluid-filled bumps that break easily. 



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