When a blunt force impacts the body, it may not break the skin, but it can rupture the delicate capillaries underneath. This trapped blood initially appears as a flat or slightly raised mark. Over time, the body’s immune system breaks down the blood and reabsorbs it, which causes the bruise to change colour. The Colour Cycle
The shifting hues of a bruise are a visual indicator of the healing stages: Lividi
Informative resources such as Mayo Clinic and Cleveland Clinic suggest seeking medical advice if: Bruises appear frequently without a known cause or injury. When a blunt force impacts the body, it
Within 1–2 days, the blood loses oxygen and becomes darker. it may not break the skin