Differential Diagnosis for Infection in Lateral Canthus
- Single most likely diagnosis
- Hordeolum (Stye): This is the most common infection of the eyelid and can occur in the lateral canthus. It's usually caused by Staphylococcus aureus and presents as a painful, swollen nodule.
- Other Likely diagnoses
- Blepharitis: Inflammation of the eyelids that can be caused by infection, leading to redness, swelling, and crustiness, particularly in the lateral canthus.
- Conjunctivitis: An infection or inflammation of the conjunctiva, which can spread to the lateral canthus, causing redness, discharge, and irritation.
- Dacryocystitis: An infection of the lacrimal sac, which can cause swelling, redness, and pain in the medial canthus but can sometimes affect the lateral area if the infection spreads.
- Do Not Miss (ddxs that may not be likely, but would be deadly if missed.)
- Orbital Cellulitis: A serious infection of the tissues surrounding the eye, which can lead to severe complications, including vision loss and cavernous sinus thrombosis. It requires prompt diagnosis and treatment.
- Endophthalmitis: A severe inflammation of the interior of the eye, usually caused by infection. It's a medical emergency that can result in blindness if not treated promptly.
- Rare diagnoses
- Molluscum Contagiosum: A viral infection that causes small, pearly, or flesh-colored bumps on the skin, which can appear in the lateral canthus.
- Keratoacanthoma: A rare, low-grade malignancy that can mimic an infectious process, presenting as a firm, dome-shaped nodule on the eyelid, including the area near the lateral canthus.