Be completely covered with:his face was a mass of bruises...
For the longest time, the cover appeared to be a mass of abstract marks, then suddenly it came clear and two schooners at sea appeared out of the scratches.
Her hair is torn out, her face is a mass of bruises and her neck is almost as thick as that of a horse.
His shoulders, back, chest, and upper arms were a mass of bruises, some of them accompanied by bleeding scrapes and cuts.