How are bruises diagnosed?
Your doctor will be able to tell whether you have a bruise simply by looking for skin discoloration. In some cases, there may be a bone fracture that causes discoloration. If your doctor suspects you have a fracture, he or she will probably order X-rays of the injured area.
Bruises that have no apparent cause may be a sign of a blood or bleeding disorder, a vitamin deficiency, or another underlying condition. In these cases, you will need to have blood tests to determine the cause. If you are taking an anticoagulant medication, your blood should be monitored periodically to ensure that the medication does not exceed the recommended level.