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A syndrome of cutaneous changes associated with sweat retention and extravasation of sweat at different levels in the skin. Miliaria rubra, or prickly heat, results from apocrine duct obstruction. The sweat then seeps into the epidermis, producing pruritic erythematous papulovesicles. (From Dorland, 27th ed)

Syn.: prickly heat, red gum, heat rash, lichen tropicus, strophulus. An eruption of inflammatory miliary vesicles and papules at the mouths of the sweat follicles. It differs from m. crystallina by the addition of the inflammation. The lesions are the same as in m. crystallina, except that they are situated upon a slightly inflamed base. The disease generally occurs following exposure to high temperatures. [Lat.]