In the final stages (day 10–14), the substance becomes bilirubin before the mark fades completely. Prevention and Care

The shifting hues of a bruise are a visual indicator of the healing stages:

(bruises) are common skin discolourations that occur when small blood vessels (capillaries) near the skin's surface break from the impact of an injury, causing blood to leak into the surrounding tissue. Biological Process

A bruise appears after a blow to the head or trunk, which could indicate internal injury. If you are experiencing specific symptoms,

Informative resources such as Mayo Clinic and Cleveland Clinic suggest seeking medical advice if: Bruises appear frequently without a known cause or injury.