\(y=\frac{1}{x}\) 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.
Certain infections and diseases can cause bleeding under the skin, such as: 1  meningitis, an inflammation of the membranes covering the brain and spinal cord. 2  leukemia, a cancer of the blood cells.  strep throat, a bacterial infection that causes a sore throat.