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Hello,Thank you for your question.I am Dr Saha, I shall try my best to help you.
I am sorry for your health condition.The swelling is likely due to an allergy.The cause of allergy is often not apparent.Food is often a factor.But it can occur from environmental allergens too.Sometimes, bite, infection etc can cause it.As it occurred before & subsided, it is likely from allergy.When the swelling is repeating, it is necessary to see doctor. Because if it progresses it can involve tongue, cause edema of the throat, breathing distress etc where it can become an emergency. You can take benadryl or Zyrtec till you see doctor.I hope this information helps.If there’s anything else I can do, please let me know.If you are satisfied, please rate my answer as good or excellent.Regards.