Why do we get an Eye Stye? + more videos |

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Eye stye or hordeolum is a painful, pimple-like bump near our eyelids. It is caused due to staphylococcus bacterium which lives harmlessly on our skin.
Now, our eyelids contain three glands called gland of Zeis, gland of Moll and meibomian gland. Gland of Zeis secretes an oily substance to lubricate our eyelashes. Gland of Moll is a sweat gland. While, meibomian gland prevents the evaporation of our eye's tear film. Sometimes, in the above glands, dead skin cells and bacteria get trapped, leading to an infection, thus giving rise to a stye.
If infection occurs in the glands of Zeis or Moll, it is called an external stye. However, if the infection occurs in meibomian gland, it is called an internal stye. Also, as an internal stye presses against our eye, it proves to be more painful than an external stye.