\(y=\frac{1}{x}\) This means that the line y=0 is a horizontal asymptote. Horizontal asymptotes occur most often when the function is a fraction where the top remains positive, but the bottom goes to infinity. Going back to the previous example, \(y=\frac{1}{x}\) is a fraction.
Causes of Wounds. Wound causes can be internal or external in origin. Wounds of internal origin are mainly due to impaired circulation, neuropathy or medical illness. Wounds of external origin are due to an outside force or trauma that causes open or closed wounds.
Causes of localized swelling include: 1  Injury to a specific body area. Bruising (hematoma) from an injury is caused by tears in the small blood vessels under the skin. 2  Infection, which can occur in a joint or under the skin. An abscess is a pocket of pus that forms at the site of infected tissue. Cellulitis is a skin infection that can cause mild or severe swelling. Burns, which can cause swelling at the site of the burn or in a larger area around the burn.