Chemosis is swelling of the clear membrane covering the white of the eye. It often looks like a blister or jelly-like bulge.
Common causes
Fluid leakage from small blood vessels in the conjunctiva leads to puffiness. This frequently follows irritation or allergy.
- Allergic conjunctivitis from pollen, dust, or pets
- Infection or severe dry eye
- Rubbing the eyes vigorously
- Post-surgical inflammation or trauma
Serious underlying problems
Marked, one-sided chemosis with pain or limited eye movement can signal orbital disease. These cases require urgent evaluation.
- Orbital cellulitis infection behind the eye
- Thyroid eye disease with congestion and proptosis
- Carotid-cavernous fistula causing red, swollen eye
- Seek emergency care if chemosis accompanies fever or reduced vision
