Questions about pink eye/conjunctivitis? Does it always need to be treated? Is it contageous?

Sometimes. Conjunctivitis can be bacterial, in which case it's contagious and needs to be treated with antibiotics. It can be viral, and then it's sometimes treated with medicines for inflammation. Viral conjunctivitis is contagious too. It can be allergic and treated with antihistamines, but allergic conjunctivitis is not contagious.

Related Questions

How many days before the symptoms of conjunctivitis/pink eye start is it contagious?

Varies. Bacterial pink eye is usually pretty fast. Your eye comes in contact with the germ, it grows, and you have symptoms. Viruses can incubate for days, weeks, or months before symptoms begin. Allergies begin when you are exposed to the substance to which you are allergic. Bacteria and viruses are contagious. Allergies are not. Read more...