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Hello and thank you for asking your question. My name is***** will try to help.
It sounds like he is having an allergic reaction or he was stung by something. Do you have benadryl? How much does he weigh?
Ok I would go to the store and buy 25mg tablets. Give him one now and then repeat every 12 hours until his lip is back to normal. If he will let you hold a cold pack on the lip for 20 minutes every hour until bedtime.
Monitor him for the next 8 hours. If the swelling spreads to the face, his gums turn pale or an abnormal color, he becomes very lethargic and will not get up, or you notice anything else concerning then take him to the ER vet right away because he could be having a severe allergic reaction and need a cortisone shot to stop it.
Does that help? Do you have any other questions for me?