Loiasis is a filarial infection endemic to certain areas of Central and West Africa.
Subconjunctival migration of the adult Loa Loa worm may occur and may be visible to the naked eye. The patient may actually feel the worm's presence, or a local conjunctivitis may occur. The typical skin finding is the calabar swelling--a painless, non-pitting, localized swelling which lasts approximately 3 days.
The worm may be extracted by an ophthalmologist. Diethylcarbamazine may be used both for prophylaxis and treatment.
There is something in your eye
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