A Chalazion is a painless, smooth, round bump typically situated in the midportion of the eyelid.
A chalazion develops when an oil gland in the eyelid becomes blocked. If an internal hordeolum doesn't drain and heal, it can turn into a chalazion.
A chalazion forms a firm lump or cyst under the skin of the eyelid.
Chalazia grow more slowly than styes. If a chalazion gets large enough, it may interfere with vision.
The inflammation and swelling may spread to the area surrounding the eye.
Chalazia often go away in a few months without treatment.