Hair missing on cats ears

bonepicker

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She gets revolution drops, and does not go outside, might this be an allergy? I do not see any dirt in her ears!
 
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LTS3

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It could be an allergic reaction to the Revolution. My Aby used to get bald spots on his heads and head after an application of Revolution. The balding stopped after I took him off Revolution per the vet's advice. The vet put my Aby on Heartworm instead. Heartworm doesn't take care of the same parasites as Revolution but the vet felt that it was better than no protection.  My other cat still gets Revolution.
 
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