Abrasion is the milder form of injury compared to laceration because it only involves the scraping away of a certain region of the integument. Thus, it is a more superficial (the most superficial) type of wound.
Trauma to the nail can cause the nail plate to be torn from the nail bed. Unlike other types of avulsion, when a nail is lost, it is not typically reattached. Following the loss of the nail, the nail bed forms a germinal layer which hardens as the cells acquire keratin and becomes a new nail.
2. a wound produced by the tearing of body tissue, as distinguished from a cut or incision. External lacerations may be small or large and may be caused in many ways, such as a blow from a blunt instrument, a fall against a rough surface, or an accident with machinery.
Puncture wounds usually cause pain and mild bleeding at the site of the puncture. It is usually fairly obvious if a person is cut. However, small pieces of glass may cause puncture wounds that a person may not notice at first.