Eyelid swelling (periorbital oedema) due to an acute allergic reaction. Allergens that may cause an allergy such as this include pollen (hayfever), an

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Eyelid swelling (periorbital oedema) due to an acute allergic reaction. Allergens that may cause an allergy such as this include pollen (hayfever), animal hair or an insect bite, although the cause here was unknown. Allergens can provoke an exaggerated response from the immune system.

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Photo credit: © DR P. MARAZZI/SCIENCE PHOTO LIBRARY / Alamy / Afripics
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Keywords: acute, allergen, allergic, allergy, animal, clinical, condition, diagnosis, disorder, exaggerated, eye, eyelid, hair, hayfever, healthcare, immune, inflamed, inflammation, medical, oedema, ophthalmology, periorbital, reaction, response, swelling, swollen, system, unknown