Blepharitis: This is a common condition characterized by inflammation of the eyelids, leading to symptoms such as crusting, redness, and itching. The continuous crusting is often due to the accumulation of debris and bacteria at the base of the eyelashes.

Dry Eye Syndrome: This condition can lead to irritation and inflammation of the eyes and eyelids, resulting in crusting, especially in the morning.
Conjunctivitis: Infections or allergies causing conjunctivitis can lead to crusting of the eyelids, along with redness, discharge, and itching.
Demodex Infestation: Demodex mites can live in the eyelash follicles and cause inflammation, leading to crusting and other symptoms similar to blepharitis.
Seborrheic Dermatitis: This skin condition can affect the eyelids, causing a flaky, crusty appearance, along with redness and itching.

Orbital Cellulitis: Although less common, this serious infection of the tissues surrounding the eye can cause swelling, redness, and crusting of the eyelids, along with severe pain and vision changes. It requires immediate medical attention.
Herpes Zoster (Shingles): When affecting the eye (herpes zoster ophthalmicus), it can cause a painful rash, crusting, and potentially serious complications if not treated promptly.

Rosacea: A skin condition that can cause ocular symptoms, including crusting of the eyelids, due to inflammation and possibly Demodex mites.
Sarcoidosis: A systemic disease that can affect the eyes, causing uveitis, conjunctivitis, and potentially crusting of the eyelids, among other symptoms.
Lacrimal Gland Dysfunction: Abnormalities in the lacrimal gland can lead to decreased tear production or altered tear composition, potentially causing crusting and other eye symptoms.