CHALAZION
If an oil-secreting gland in the eyelid becomes blocked, the gland enlarges, creating a swelling called a chalazion. A chalazion may at first look like a stye, but, unlike a stye, it is not on the eyelid margin. Usually, the pain and redness associated with a chalazion disappear after a few days. However, if the swelling is large, it may cause long-them discomfort, and pressure on the front of the eye can interfere with vision.
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