Conjunctivitis is the medical name for pink eye. It involves inflammation of the outer layer of the eye and inside of the eyelid. It can cause swelling, itching, burning, discharge, and redness.
Bacterial or viral infection
Substances that cause irritation
Contact lens products, eye drops, or eye ointments
Pinkeye usually does not affect vision. Infectious pink eye can easily spread from one person to another.
The infection will clear in most cases without medical care, but bacterial pinkeye needs treatment with antibiotic eye drops or ointment.