Blepharitis: This is an inflammation of the eyelids that can cause edema (swelling) and erythema (redness) due to infection or allergy. It's a common condition that affects the eyelid margins.

Allergic Conjunctivitis: An allergic reaction to substances like pollen, dust mites, or pet dander can lead to eyelid edema and erythema, along with itching and discharge.
Contact Dermatitis: Irritation from cosmetics, soaps, or other chemicals can cause an allergic or irritant reaction leading to eyelid swelling and redness.
Hordeolum (Stye): A localized infection or inflammation of the eyelid margin involving hair follicles of the eyelashes or meibomian glands, which can cause swelling and redness.

Orbital Cellulitis: A serious infection of the tissues surrounding the eye, which can cause eyelid edema and erythema, along with proptosis (bulging of the eye), pain, and vision changes. It requires prompt medical attention.
Herpes Zoster Ophthalmicus: Shingles affecting the eye, which can lead to severe pain, eyelid edema, and erythema, potentially causing permanent vision loss if not treated promptly.
Angioedema: A condition characterized by rapid swelling of the dermis, subcutaneous tissue, mucosa, and submucosal tissues, which can be life-threatening if it involves the airway.

Granuloma Faciale: A rare skin condition characterized by single or multiple, benign, reddish-brown, indurated plaques or nodules, typically on the face, which can involve the eyelids.
Wegener's Granulomatosis (Granulomatosis with Polyangiitis): A rare autoimmune disorder that can affect various parts of the body, including the eyes, causing inflammation and damage to the blood vessels, potentially leading to eyelid edema and erythema among other symptoms.
Sarcoidosis: A condition in which inflammatory cells (granulomas) form in various organs, including the eyes, potentially causing uveitis, eyelid swelling, and other ocular symptoms.