• The causes include:
• It is commonly caused by bacterial infection (staphylococcus).
• External stye may be caused by the infection of:
• Eyelash follicle – holes for growing eyelashes
• The Sebaceous gland – sebum producing gland that prevents eyelashes from drying out
• The apocrine gland
• Internal Stye may be caused when meibomian glands becomes infected.

If untreated for a prolonged period it may lead to:

Chalazion (Meibomian cyst)

• If you have a long term internal stye, it can become chalazion.
• They develop if one of the glands in the eyes becomes blocked.
• Warm compress can help relieve the symptoms but some rare cases require surgical removal.

Preseptal Cellulitis

• If the infection spreads to the nearby tissues around the eye this can cause preseptal cellulitis.
• It is the inflammation of the layers of skin around the eyes.
• This can be treated with antibiotics.