Wiktionary
bruise up
vb. 1 (context transitive English) To cause bruises to appear, usually by beating or battering. 2 (context intransitive English) To show bruises.
Usage examples of "bruise up".
My favorite, though, is to make it so when the bully just touches his victim, I make the victim's nose bleed like a river, make him bruise up around his eye or jaw.