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You are likely correct, in your suspicion that this is probably an Aural Hematoma, which is basically a pocket of blood and fluid in the ear flap. It's often caused by excessive scratching or head-shaking, sometimes as a result of an ear infection. This is a condition that traditionally was treated surgically, but many cases do NOT require surgery, as the fluid will eventually reabsorb. I typically do not recommend draining these hematomas, as they often fill back up again very quickly. In most cases, treating the underlying ear infection, if any, is all that is needed. As the hematoma resolves, the ear flap may wrinkle or curl, so in cases where that is undesirable, such as for a show dog, surgery might be more beneficial.