Conjunctivitis is commonly called “pink eye”. It happens when the conjunctiva is irritated by infection or allergies. The conjunctiva is the outer, normally clear covering of the white part of the eye (sclera). Your eyes are red and swollen and sometimes they have a sticky discharge. Some types of pink eye are highly contagious.
There are three main types of conjunctivitis
Viral conjunctivitis is the most common type of pink eye. This conjunctivitis is very contagious and often spreads through schools and other crowded places. It usually causes burning, red eyes with a watery discharge.
Bacterial conjunctivitis is also very contagious. An infection from bacteria causes this form of pink eye. With bacterial conjunctivitis, you have sore, red eyes with a lot of sticky pus.
Allergic conjunctivitis is a type of pink eye that comes from an allergic reaction to something. It is not contagious. Allergic pink eye makes your eyes very itchy, red and watery.