Blepharitis is a common eyelid condition causing redness, irritation, and crusting. While not sight-threatening, it can lead to complications if untreated. Proper eyelid hygiene—using wipes, warm compresses, or electronic devices—can reduce flare-ups and help manage dry eye symptoms.

A chalazion is a clogged oil gland of the eyelid. These are quite common and have many predisposing risk factors: poor eyelid hygiene, eyelid infections, hormonal changes, ocular rosacea, chronic immune deficiency, chronic bacterial buildup or inflammation of the eyelids (blepharitis), and others.

Demodex are microscopic, parasitic mites that live on the skin and hair follicles of the face including the eyelids and eyelashes. They feed on the oil content of sebaceous glands in the skin and the oil (meibum) in the meibomian glands of the eyes.