Complications of a sty are rare. The infection may spread to other eyelash follicles, leading to multiple styes. A chalazion (a form of scarring of the glands in the eyelid that may include the formation of cysts) is the most common complication that develops from a sty. Chalazia can be large enough to deform the cornea of the eye and interfere with vision, and they may cause a cosmetic problem. Other potential complications include a generalized infection (cellulitis or blepharitis) of the eyelid, and improper drainage of a sty may lead to deformity or disruption of growth of eyelashes. Progression of a sty to a systemic infection (spreading throughout the body) is extremely rare, and only a few instances of such spread have been recorded.
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