Heat rash — also known as prickly heat and miliaria — isn't just for babies. Though it's most common in infants, heat rash affects up to a third of adults living in tropical climates and can pla

Heat rash -- also called prickly heat or miliaria -- is a common condition in which areas of the skin itch intensely and often feel prickly or sting due to overheating. Heat rash looks like tiny