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A hematoma is a localized collection of blood outside of blood vessels, in cats and dogs it is typically in the visible part of the ear that resides outside of the head, the pinna.  Trauma, excessive scratching and shaking of the head are common causes of hematomas in companion animals. We recommend surgery to open and drain the hematoma and remove clots. Sutures are then used to tack the skin layers to eliminate any space for more blood to accumulate.  The cause of the initial irritation needs to be determined and treated to reduce the chances of recurrence.  Diligent after care is required to ensure proper healing and reduce scarring.