If the hematoma is not drained then you may end up with a dog that has a crumpled ear. The scarring will make the ear look unsightly to many.
You maybe getting repeat ear infections due to a problem such as a food allergy.
You can read about ear infections here
http://marvistavet.net/html/body_ear_infections.html
and about aural hematoma's here
http://marvistavet.net/html/body_aural_hematoma.html
You may want to get the ear cultured to see what kind of infection you are dealing with there. And you might want to see if going to a diet change such as Wellness fish, duck, rabbit, or venison formula will end the ear infections.
Hope this helps you!
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