Why do bruises change color?
Rainbow Knee Repair
Why do bruises change color?
You bang your knee on the coffee table—ow!—and the next morning, there's a dark purple splotch blooming on your skin like someone dropped an inkblot under the surface. By the end of the week, it's faded to greenish-yellow, then vanished entirely. What just happened under there?
When you whack your knee, tiny blood vessels under your skin—capillaries, thinner than hairs—break open. Blood leaks out into the surrounding tissue like water from a burst pipe flooding a basement. Your body sees this mess and immediately sends in the cleanup crew.
