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A. If you think the centipedes that were eaten may have been poisonous, you should seek the care of a veterinarian or emergency clinic in your area. If your cat's ear has been swelling, it can be caused by a number of things ranging from ear mites or ear infection, to something called a hematoma. This is a pooling of blood and fluid under the skin of the outer ear flap. Keeping your cat quiet and preventing him or her from scratching and chewing at the spot, or from shaking their head can help in minor cases. However if the swelling continues for more than a day, or the swelling spreads to the face, head or neck, veterinary treatment is needed.
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