Probably should take your pet to the vet. If there is swelling and squinting could have a corneal ulcer which can go from bad to worse really fast. If you think it is an allergic reaction Benadryl 1mg/lb every 6 hours or so may help take the swelling down but still good to have an exam done to make sure and f it's severe may need to do injectable steroids etc. Could be seasonal allergies.
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