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This is Dr. David
most sty's are caused by a viral infection.
antibiotics don't work on viral infections.
you need to go back to see your doctor if your eye is swollen back up again.
you could have a viral infection or herpetic infection of the eye
is there pain with the swelling?
you should be using warm compresses on your eyes which can help
and improving your immune system, getting more sleep, eating more fruits and vegetables, vitamin C, eating 1-2 oranges a day can help improve your immune system.