Final answer:
A hordeolum, also known as a stye, is the term for a localized infection or inflammation of the eyelid margin involving the hair follicles of the eyelashes.
Step-by-step explanation:
The term for a localized infection or inflammation of the eyelid margin involving hair follicles of the eyelashes is a hordeolum, commonly known as a stye. This condition is not directly listed in the provided reference material, but it is characterized by a painful lump on the eyelid and is usually caused by a bacterial infection. Options a) Chalazion and b) Blepharitis are both also related to eyelid conditions, but a Chalazion is a painless lump caused by a blocked oil gland, whereas Blepharitis is inflammation of the eyelids. Option d) Conjunctivitis is an inflammation of the conjunctiva, not the eyelid margin.