The bruise is accompanied by extreme swelling or severe pain. The person is taking blood-thinning medications.
The shifting hues of a bruise are a visual indicator of the healing stages: Lividi
While most bruises heal on their own within two weeks, recovery can be managed through the method: Rest: Avoid further strain on the injured area. The bruise is accompanied by extreme swelling or severe pain
Within 1–2 days, the blood loses oxygen and becomes darker. Within 1–2 days, the blood loses oxygen and becomes darker
(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
Informative resources such as Mayo Clinic and Cleveland Clinic suggest seeking medical advice if: Bruises appear frequently without a known cause or injury.