Describe the features of a bruise.?

Bruise: When the skin is traumatized, usually by a direct blow, small capillaries are damaged and leak blood cells. These spread through the interspaces under the skin leading to the bluish discoloration called a bruise. Unless associated with bleeding disorders, or the trauma caused deeper injury, these can be treated with icing for 2-3 days and then heat later to resolve the bruise.