In the context of skin conditions, what does the term "prickly heat" refer to?

The term "prickly heat" specifically refers to miliaria rubra, a skin condition characterized by red, itchy bumps that can arise from blocked sweat glands. This condition is common in hot, humid weather when excessive sweating occurs, particularly in infants and young children. The blockage of sweat glands leads to irritation and inflammation, which is what causes that prickly or stinging sensation on the skin, hence the name "prickly heat."

In contrast, the other options refer to different skin issues. Sunburn results from overexposure to the sun's ultraviolet (UV) rays and presents as red, inflamed skin. Chafing is caused by friction between skin surfaces or against clothing, often leading to irritation or rashes, particularly in sensitive areas. Acne involves clogged hair follicles that lead to pimples, blackheads, or cysts, primarily due to hormonal changes and oil production rather than sweating. Understanding these differences helps in accurately identifying and addressing skin conditions.