An external bruise represents bleeding beneath the skin. If sufficient bleeding occurs to create a lump, this is called a hematoma. Such injuries result from direct force applied to the skin surface, resulting in the tearing of subcutaneous blood vessels. The pattern of bleeding may be circular, surrounding a central bleeding point where the blow has stretched and torn a blood vessel wall. When multiple blood vessels are torn because of the use of a specific instrument, the bleeding pattern may conform to the outline of that instrument. For example, a blow inflicted with a human fist can produce multiple circular bruises in a pattern that conforms to the tips of the knuckles (.F..ig,.,2.57..:.2.). Similarly, pressure from fingertips such as occurs when someone grabs another by the arm may produce around of circular oval bruises. In contrast, a strike with a police baton can produce parallel linear bruises conforming to the diameter of the baton ( Fig 2.5.7:3.).
Was this article helpful?
This guide will help millions of people understand this condition so that they can take control of their lives and make informed decisions. The ebook covers information on a vast number of different types of neuropathy. In addition, it will be a useful resource for their families, caregivers, and health care providers.