A member asked:

What could cause a large light black back bruise? i have a bruise like discoloration (5inx4in) in the middle of my back but never had any blunt traum

A doctor has provided 1 answer

Bruises are from: damaged blood cells and blood vessels, so the process is not always of traumatic etiology. The contents of a blood cell and blood vessel, when spilled into skin tissue, will change its color and consistency, as well as stay there until it is absorbed. Blood vessel diseases, platelet diseases, and tumor/cancer can cause non-traumatic bruises, along with certain kidney and connective tissue disea

Answered 6/12/2018

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Thank

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