Bumping into something often causes a bruise. The bruise can appear quickly or maybe not until the next day. The size or color of the bruise does not mean much. Most bruises start off as "black and blue", get darker, then begin to lighten and change to all colors of the rainbow. The colors may spread out. These are quite usual.
It is caused by a bunch of broken blood vesseles, causing the color of a bruise to change.
yellow purple and red
A bruise is a collection of blood under the skin, in the subcutaneous tissue. Over time, the bruise changes color because the hemoglobin is broken down and absorbed. The different colors represent the color of the heme in various states of breakdown.
That was a pretty deep bruise that is now mostly healed. All bruise colors are from hemoglobin, the red compound in red blood cells. This causes the initial red/purple color of a new bruise. As the hemoglobin breaks down it turns into biliverdin, which causes the greenish color. That will break down into bilirubin which looks yellow. Then the breakdown will be completed and the bruise will be healed.
Bruises change colors over time in a predictable pattern, so that it is possible to estimate when an injury occurred by the color of the bruise. Initially, a bruise will be reddish, the color of the blood under the skin. After one to two days, the red.
The color blue is known to reduce anxiety.
The color blue is known to reduce stress.
The color is the blood from broken blood vessels that have ruptured in the impact area
Blood oxidation in the sub dermal skin layer.
ummm..... please specify what the difference between a bruise and a bruise is :)
Generally, the best practice is to apply ice within the first 24 hours.