Why Do Bruises Turn Colors?

 A medical explanation for the rainbow of colors that occurs in skin bruises

Sanaz Majd, MD
1-minute read

The colors of a bruise appear courtesy of proteins being broken down inside the white blood cells. The first color is purple, which is caused by the hemoglobin being broken down and losing its oxygen. That happens immediately after the injury.  

The first breakdown product of hemoglobin is called biliverdin, which appears within a few days of the contusion and explains the greenish tint. The green biliverdin is then converted to a yellow molecule called bilirubin. That process takes anywhere between a few days and several weeks, depending on the size of the bruise. Once bilirubin is made, it dissolves in the blood stream and is carried off to the liver and kidneys for final processing and excretion.  

Image courtesy of Shutterstock

Please note that all content here is strictly for informational purposes only. This content does not substitute any medical advice, and does not replace any medical judgment or reasoning by your own personal health provider. Please always seek a licensed physician in your area regarding all health related questions and issues.

About the Author

Sanaz Majd, MD

Dr. Sanaz Majd is a board-certified Family Medicine physician who graduated from Drexel University College of Medicine in Philadelphia. Her special interests are women's health and patient education.