What condition is characterized by inflammation of the eyelid?

Blepharitis is the correct choice as it specifically refers to the inflammation of the eyelid, which can involve both the skin and the eyelashes. This condition can result from various causes, including bacterial infection, seborrheic dermatitis, or clogged oil glands. Symptoms often include redness, swelling, and crusted eyelids.

The other options describe different eye-related conditions. Conjunctivitis, commonly known as pink eye, refers to inflammation of the conjunctiva, which is the membrane covering the white part of the eye and lining the eyelid. Styes are localized infections that result in swelling and tenderness on the eyelid but are considered a specific type of eyelid infection rather than a general inflammatory condition like blepharitis. Pink eye is another term for conjunctivitis, not specifically tied to eyelid inflammation. Therefore, blepharitis is distinct in that it directly addresses the inflammation of the eyelid itself.