There are many different reasons for bruising and reasons to want to cover them up! eg: a job interview, wouldn’t it be handy to cover that unsightly bruise on your hand/arm or otherwise!? The same idea as tattoo cover, it may just be for a special occasion or for an event that will be photographed such as a business party or ”bizparty” .
Yellow: takes away brown tones
Green: takes away red tones
Purple/violet: Takes away blue tones
Here are the before and after pics of a bruise i covered on my own leg when i bumped into the bed frame! ouch!