Wart Or Lump On Dogs Ear. A white bump on the dog's ear flap is most likely to be an insect bite, a wart or skin tag, a cyst, or an aural hematoma. The lump on this dog's ear is likely a histiocytoma.
It is a virus that produces fairly benign disease, with the primary symptom being the development of growths (papillomas) on the body. Other growths can also occur on a dog’s body. Usually these will go away on their own within a few weeks to months.