Superficial vein is a term used to describe a vein that is close to the surface of the body. It is used to differentiate veins that are close to the surface from veins that are far from the surface, known as deep veins.
Superficial veins are important physiologically for cooling of the body. When the body is too hot the body shunts blood from the deep veins to the superficial veins, to facilitate heat transfer to the surroundings. Superficial veins can be seen under the skin.
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.
How long? A couple minutes to a couple hours, to even a couple days. It all depends on what kind of impact caused the bruise.As for what causes a bruise to appear, an impact against your body that doesn't break the skin may break the blood vessels under your skin. Possibly from crushing them against a bone or simply hitting the area too hard. The blood seeps out of the capillaries, but under the skin, creating a dark spot.
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.
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