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What are black-and-blue bruises?

In: Health, Conditions and Diseases [Edit categories]

Answer:

I don't know why bruises are black and blue but i know that they are a bleed underneath the skin!

The blood is deprived of oxygen and turns blue.

First answer by ID1376935060. Last edit by ID1376935060. Question popularity: 1 [recommend question].

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Why are bruises black and blue?
they are not all black and blue. they change color by how bad they are. brown yellow and light green means that its not very bad as in purple blue and black are bad.
How do you treat a black and blue bruise?
let it be until it goes away.
Why does bruise turn black and blue?
Because that is the blood underneath your skin trying to heal where you bumped into
A bruise turns black and blue because?
because the bruise is blood under the skin..and the blood cells break down and realease chemicals that causes your skin to turn black and blue
What causes black and blue bruises?
Trauma or anything causing subdural bleeding.