What is a key characteristic of measles?

A key characteristic of measles is a lasting fever followed by a facial rash. Measles typically begins with symptoms such as a high fever, cough, runny nose, and conjunctivitis. After a few days, as the virus progresses, a distinctive rash appears that usually starts at the hairline and spreads downward across the body. This progression from fever to rash is a hallmark of the illness and helps distinguish it from other conditions. The presence of the fever prior to the rash is significant because it indicates the systemic infection that accompanies measles. The rash itself often is described as a red, blotchy eruption, which is also an important diagnostic feature. This sequence is crucial for recognizing and managing the disease effectively.