Which of the following is a common sign of acute inflammation?

The presence of redness is a common sign of acute inflammation and is often referred to in the context of the classic signs of inflammation, which include redness, heat, swelling, pain, and loss of function. This redness occurs due to the dilation of blood vessels in the affected area, leading to increased blood flow as the body responds to injury or infection.

The increase in blood flow brings immune cells to the site of inflammation, which are essential for combating pathogens or repairing damaged tissues. This physiological response is a crucial part of the inflammatory process aimed at healing and protection. Understanding the significance of each sign of inflammation is vital, as it helps in recognizing the body's response to injury and in assessing the severity of various conditions in clinical practice.