Stye is a painful swelling in the root of an eyelash due to infection. This is also caused due to blockage of an oil producing gland on the eyelid causes a small, hard painless lump which is known as Chalazion or Meibomium Cyst.
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Treatment : it should be treated by a specialized eye specialist. In many cases to clean away the pus, a stye should be bathed with tepid saline water.
