Slide show: Poison ivy and other summer skin irritants
Photos of heat rash
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Heat rash or prickly heat develops when blocked sweat ducts trap perspiration under your skin. Miliaria rubra (A), one type of heat rash, appears as red clusters of small blister-like bumps that can be itchy. Miliaria crystallina (B), another type of heat rash, appears as clear, fluid-filled bumps.

Heat rash isn't serious and usually resolves quickly when the affected area cools. In the meantime, reduce sweating by staying in an air-conditioned space or using fans to circulate the air. Wear lightweight clothing and limit intense physical activity. Apply cool compresses or soak in a cool bath for greater relief.

June 25, 2020