Ear Hematoma 

Hematoma of the ear flap is an accumulation of blood between the cartilage from vigorous repeated head shaking or scratching at the ears with the back feet. Occasionally the damage results from the ear striking a sharp edge during head shaking.
The most common underlying causes of head shaking are ear infections, ear mites, and fleas.

Important Points in Treatment
In most instances, general anesthesia is necessary to allow healing of the hematoma fluid and surgical repair.
Treatment of infections and/or ear mites is necessary to allow healing and prevent recurrence of the conditions that cause the hematoma.