Why is my eye crusty and eyelashes falling out?

Blepharitis: The crusting could be a type of inflammation called "blepharitis" or it could be an eye infection. The lashes may be falling out because of the blepharitis, or it may be a sign of an underactive thyroid. You would need to have an eye physician check your crusting eyelids, and you might need a simple blood test to check your thyroid.

Allergies or blepharitis: Allergies cause itching & tearing. Over-the-counter allergy medicine & eyedrops help relieve it. Zaditor (ketotifen) is a good eyedrop. Blepharitis also causes itching & this can occur with allergies. It's a minor infection of the eyelids. Crusting & tearing is common. Warm compress with daily baby shampoo washing of the eyelids helps relieve this. Severe cases are placed on antibiotics by your doctor.