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How is a sty diagnosed?
The doctor will examine the lids to locate the opening of the plugged gland. This helps to distinguish between a hordeolum and a chalazion. Also, the doctor will look for signs of scar tissue, foreign bodies, or underlying chronic meibomitis to determine the cause.
In addition, the doctor will look for any signs that the gland may have become infected. It is particularly important to identify infection that has spread from the gland to the neighboring skin, tissue around the eye, or the eye itself.