A<unk>  is an injury to biological tissue in which the capillaries are damaged, allowing blood to seep into the surrounding tissue.  It is usually caused by blunt impact.<unk> s often induce pain but are not normally dangerous. Sometimes<unk> s can be serious, leading to other more life threatening forms of hematoma, or can be associated with serious injuries, including fractures and internal bleeding.  Minor<unk> s may be easily recognized, in people with light skin color, by their characteristic blue or purple appearance (idiomatically described as "black and blue") in the days following the injury.
The presence of<unk> s may be seen in patients with platelet or coagulation disorders. Unexplained<unk> ng may be a warning sign of child abuse or serious medical problems, such as leukemia and meningoccocal infection. Unexplained<unk> ng could indicate internal bleeding or certain types of cancer.  A deficiency in Vitamin C can also make a person more susceptible to<unk> s from impacts. Also long term glucocorticoid therapy can cause easy<unk> ng.
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