Which of the following is a condition characterized by an inflammation of the eyelash follicle?

The condition characterized by inflammation of the eyelash follicle is indeed hordeolum. A hordeolum, commonly known as a stye, occurs when the glands located at the base of the eyelash become infected or inflamed. This results in a painful, red lump on the eyelid that can be filled with pus, indicating an acute bacterial infection.

In contrast, blepharitis is more generalized inflammation of the eyelid margins, which can involve multiple hair follicles, but is not limited to the infection of a specific eyelash follicle. Conjunctivitis, commonly referred to as pink eye, involves inflammation of the conjunctiva, the membrane covering the white part of the eye and the inner eyelids, rather than the follices of the eyelashes. A chalazion is a cyst that forms when an oil gland in the eyelid becomes blocked, which does not directly involve the inflammation of eyelash follicles either. Understanding the specific characteristics and distinctions of these conditions is crucial in accurately diagnosing and managing them.