In miliaria, sweat flow is obstructed and trapped within the skin, causing skin lesions.
Miliaria most often occurs in warm humid weather but may occur in cool weather in an overdressed patient. Lesions vary depending on the depth of tissue at which the sweat duct is obstructed.
Diagnosis is by clinical appearance in the context of a hot environment.
Treatment is cooling and drying of the involved areas and avoidance of conditions that may induce sweating; an air-conditioned environment is ideal. Once the rash develops, corticosteroid creams or lotions can be used, sometimes with a bit of menthol added.
Last full review/revision April 2013 by David M. Pariser, MD
Content last modified November 2013