7 year old bruise, hemotoma on top of foot

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Hematomata can be problematic from causing excessive pressure and resulting tension on already compromise tissues, sometimes resulting in necrosis and ulceration, to serving as a fertile ground for infection to calcification and permanency of the mass. I cannot tell you from a picture what is appropriate treatment at this time, but I would not agree that there is nothing else to be done unless an actual full and knowledgeable evaluation has determined that.