noun

an injury appearing as an area of discoloured skin on the body, caused by a blow or impact rupturing underlying blood vessels.

his body was a mass of bruises after he had been attacked

contusion,lesion,mark,injury,black-and-blue mark,skin discoloration,blackening,swelling,lump,bump,welt,black eye,shiner,ecchymosis,trauma

verb

inflict a bruise or bruises on (a part of the body).

I fell and bruised my knee

contuse,injure,mark,make black and blue,discolour,blacken,hurt,blemish,damage,spoil,impair,mar