What is one of the 5 signs of inflammation?

One of the five signs of inflammation is redness, also known as erythema. This occurs due to increased blood flow to the affected area as blood vessels dilate in response to inflammatory mediators. This heightened blood flow brings immune cells and nutrients to help fight infection and promote healing. Redness is often accompanied by warmth, swelling, pain, and loss of function, which are the other classic signs of inflammation.