Why Do Bruises Change Colors?

What happens in your body after you get a bruise? Quick Questions explains!
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Sources:
http://health.howstuffworks.com/skin-care/problems/beauty/bruise.htm
http://highered.mheducation.com/novella/MixQuizProcessingServlet
http://onlinelibrary.wiley.com/doi/10.1111/j.1939-3938.2009.01028.x/full
http://proceedings.spiedigitallibrary.org/proceeding.aspx?articleid=838400
http://proceedings.spiedigitallibrary.org/proceeding.aspx?articleid=1273666
http://onlinelibrary.wiley.com/doi/10.1002/lsm.20494/abstract
http://www.hmdb.ca/metabolites/HMDB01008
https://books.google.com/books?id=BKILM5KWFKwC&pg=PA241
https://books.google.com/books?id=_JdZN69AecoC&pg=RA4-PR1-IA2