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Greetings,Thank you for your question.I am Dr. Su S.I will try my best to help you.
Did you give any medicine now?
Hello again,I was waiting for response from you.The symptoms can be due to an allergic reaction.Lip swelling can occur from allergy.Response to allergen varies from person to person.
As he has history of allergy, it can be a factor.Other cause can be from a bite, infection.You can give benadryl or zyrtec now.If the symptoms continue, I would advise to take him to doctor.Prescription grade medicine can be required. I hope this information will be helpful.If you have any query, please feel free to ask.If you are happy with my answer please click on the Excellent/Good rating. Wish him healthy life.Regards.