Do not worry. Blepharitis is not contagious. It is a common trouble of people of all ages.
Blepharitis is an inflammation of eyelid margins. There are many oil glands at the lid, which produce different types of oils. The lid margins changes once oil glands have something wrong and the skin of the eyelids or the eye get changed. Your eye would feel irritated and itchy due to the inflammation of the eyelid.
Blepharitis can recover quickly upon proper treatment by doctor. Many eye drops are effective. By the way, there some other alternative treatments, like a warm compress or gently cleaning the eyelids with clean water.
In addition, in ordinary life taking care of eyes and following good hygiene can help to avoid blephartis.Tell your classmate the above all and accompany with him/her.
Blepharitis can be contagious. But you do not have to leave your classmate alone because she must feel uncomfortable and fragile due to the blepharitis, if you desert her at this time, she can feel lonely and depressed. As an old saying goes that a friend in need is a friend indeed, doesn't it? I think you should encourage your friend. Also, you should keep your own eye hygiene and wash your hands and face frequently. As long as you do not use your classmate's towel or give your towel to her, you can avoid suffering from blepharitis.
Hello, it is true that blepharitis can be uncomfortable, annoying, and unattractive, but fortunately, blepharitis is not contagious and it usually will not cause any permanent damage to eyesight. It is just an inflammation of the eyelid margins. So you need not leave her alone. You can get along with her.