The condition indicated by hot, flushed skin combined with the absence of perspiration on a hot day is heat stroke. This medical emergency occurs when the body's temperature regulation fails and the core body temperature rises to a dangerous level, usually due to prolonged exposure to high temperatures or physical exertion in hot conditions.
In heat stroke, the body is unable to cool itself effectively, which is evidenced by the absence of sweating. As a result, skin may appear hot and dry. Other symptoms may include confusion, rapid pulse, and even unconsciousness. Immediate medical attention is crucial in this case, as heat stroke can lead to organ damage or even death if not treated promptly.
Heat exhaustion, on the other hand, typically presents with symptoms that include heavy sweating, weakness, and fainting. In this condition, the body can still sweat, which differentiates it from heat stroke. Mild and severe hypothermia relate to a drop in body temperature, which is not applicable in the given scenario involving heat.