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This swelling may be due to an allergic reaction caused by an insect bite or something else. It may also be the beginnings of an abscess growing in this area. Continue with the Benadryl at 1 mg per pound every 12 hrs and also apply hot compresses to this area that will draw out any infection that may be growing under the skin. Watch this area that appears as a bite and clip away the fur and apply peroxide to this to clean this. This is probably not an emergency but watch this area that has the lesion...if there is pus under the skin, it will come out at this point.
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