In miliaria rubra, blocked sweat glands cause small, red skin bumps. In miliaria rubra, the blocked sweat ducts often appear as hundreds of small pink or red bumps, all approximately the same size and shape.
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Heat Rash or Prickly Heat (Miliaria Rubra)  A parent's guide for infants and babies

Picture of Heat Rash or Prickly Heat (Miliaria Rubra): In miliaria rubra, blocked sweat glands cause small, red skin bumps. Divider line
In miliaria rubra, blocked sweat glands cause small, red skin bumps.
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Signs and Symptoms
There are 2 forms of heat rash: miliaria crystallina, which consists of tiny clear fluid-filled blisters that pop and leave behind some scale; and miliaria rubra, which has similar clear fluid-filled blisters, but they are surrounded by red areas or tiny red bumps.

In infants, lesions of miliaria crystallina tend to occur on the head, neck, and upper part of the trunk. Miliaria rubra tends to occur on the neck and in the groin and armpits.
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Last Modified: 22 Dec 2008
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