What causes a cut to get red and puffy?

When you cut yourself, your body goes into "repair mode." This process involves several stages, including inflammation. Inflammation is a normal response to injury and is essential for healing to occur.

During inflammation, the blood vessels around the cut dilate (widen), which allows more blood and oxygen to reach the area. This increased blood flow causes the cut to become red and swollen. The swelling is due to the accumulation of fluid and white blood cells in the area.

White blood cells are part of your immune system and help to fight infection. They work to clear away damaged tissue and bacteria from the cut, which is essential for healing to take place.

In some cases, a cut may become extremely red, swollen, and painful. This can be a sign of infection. If you experience these symptoms, it is important to see a doctor to rule out infection and to receive appropriate treatment.