Q. Our Jack R / Chihuahua mix has developed a lesion on the inside of his external ear any idea on what it could be and cure

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A. Fungal infections, wounds from rough bushes/hedges, self inflicted wounds from scratching, parasites and bacterial or yeast infections can all cause lesions on the ear flaps. If there is no pain, bleeding or head scratching/shaking then bathe with saline for 5 days on monitor for resolution. I would wear gloves to prevent cross infection with ringworm or mites which can be present. If any irritation is present or develops then an full work up and treatment as prescribed by a vet will be required

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