What causes the pimple that forms like a boil on the eyelids?

Question

This concerns the eye

Answer 1

It is called a stye, a chalazion. There are links in the internet

Chalazion Causes

A chalazion is caused by the oil in the gland becoming too thick to flow out of the gland. This oil that is too thick blocks up the gland, but the gland still produces more oil.

Without anywhere to go, the oil builds up inside the gland and forms a lump in the eyelid. Eventually, the gland ruptures (breaks open) and releases the oil into the tissue of the eyelid, causing inflammation.

Answer 2

it's a stye, and is caused by inflammation by the root of an eyelash.