Sty
DEFINITION
A sty (hordeolum) is a red, painful lump near the edge of your eyelid that may look like a boil or a pimple. Sties are often filled with pus. A sty usually forms on the outside of your eyelid, but sometimes a sty can form on the inner part of your eyelid.
In most cases, a sty will begin to disappear on its own in a few days. In the meantime, you may be able to relieve the pain or discomfort of a sty by applying a warm washcloth to your eyelid.
CAUSES
A sty can be caused by:
- Poor hygiene. A sty is usually caused by bacteria, especially the bacterium staphylococcus. Touching your eyes with unwashed hands can transfer bacteria to your eyelids.
- Eyelid inflammation. Chronic inflammation along the edge of the eyelid caused by a condition called blepharitis can cause a sty to form. Blepharitis may be associated with underlying conditions, such as seborrheic dermatitis or rosacea, a skin condition characterized by facial redness. Following your doctor’s instructions for treating your blepharitis can help prevent sties.
SYMPTOMS
Signs and symptoms of a sty include:
- A red lump on your eyelid that is similar to a boil or a pimple
- Eyelid pain
- Eyelid swelling
- Tearing
- Crusting around the eyelids
Another condition that causes inflammation of the eyelid is a chalazion. A chalazion occurs when there’s a blockage in one of the small oil glands at the margin of the eyelid, just behind the eyelashes. The gland can become infected with bacteria, which may also cause a red, swollen eyelid. Unlike a sty, a chalazion tends to be most prominent on the inner side of the eyelid. Treatment for both conditions is similar.
When to see a doctor
Most sties are harmless to your eye and won’t affect your ability to see clearly. Try self-care measures first, such as applying a warm washcloth to your closed eyelid for 10 to 15 minutes several times a day. Contact your doctor if:
- The sty doesn’t start to improve after 48 hours
- Redness and swelling extend beyond your eyelid and involve your cheek or other parts of your face
