Picture of Miliaria Rubra (Prickly Heat)
Miliaria rubra, known as prickly heat, is a condition in which the sweat glands become plugged and sweat is released into the surrounding skin. The miliaria rubra rash looks like reddish papules and vesicles. The lesions most commonly appear on the upper trunk, forehead, and areas where skin comes into contact with other areas of skin like the armpits, neck, and groin. Taking measures to cool off and dry off resolves this type of rash.
Text Reference: FamilyDoctor.org: “Heat Rash”