Unexplained swelling of the face, eyes, ears etc without any predisposing disease is frequently caused by allergies. An allergic reaction can occur suddenly, even in a person with no previous history of allergy. This swelling is called angioedema.
Diagnosis is by clinical examination and complete blood tests, electrolytes and renal function tests. Treatment is by antihistaminics like Benadryl or Zyrtec and steroids. If the symptoms persist then please get it evaluated from a physician. I hope it helps. Take care and regards.
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