Medically reviewed by Christine L. Larsen, MD Eye crust forms when mucus, oils, and debris accumulate, often during sleep.

It's helpful to know that only infectious conjunctivitis (meaning pink eye caused by viruses or bacteria) is contagious.

Eye pain is not uncommon and can usually resolve on its own. Common causes include styes, pink eye, or sinusitis. If you experience intense eye pain that won't go away, consider seeing an ...

There's one particular bacterium that leads to stye infections: Staphylococcus aureus. According to Tina Singh, MD, an ophthalmologist at Duke Eye Center, it's one of the most common bacteria on ...