Trauma can cause damage to blood vessels and consequently, bleeding. In most cases, this is controlled by the formation of a blood clot. However, failure to form a clot can result in prolonged bleeding which can result in life-threatening loss of blood. Prolonged bleeding is fairly obvious to detect, however, in some cases, it can be hidden within the body. Internal bleeding can occur in any part of the body and may result in poinpoint accumulations of blood in the skin that resembles measles, large accumulations of blood under the skin that resembles a bruise, etc. Causes of prolonged bleeding include: