It is hard to tell what caused the multiple bruising without seeing them and without an additional examination. The number and the dimensions of the bruises are important. If the bruises were pretty small and tend to appear on other parts of the body too, then they might be related to a coagulation disorder. The problem might originate from the coagulation factors, the activity of the enzymes required for proper coagulation, and from the condition of the blood vessels. If the blood vessels are too fragile, spontaneous bruises might appear.
You might want to visit a hematologist for blood laboratory tests related to coagulation (bleeding time, partial thromboplastin time, prothrombin time, platelet count, fibrinogen test, etc.).
If all the results are within normal range, then the bruises might have been caused by force impact on the skin and the tissue beneath. In this case the bruises would go away on their own and other bruises would not be expected to appear.
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