Styes and chalazia are common eyelid lumps with different causes and courses. A stye often appears suddenly and is painful, while a chalazion usually grows slowly and is often painless. The information here is general background and guidance on who to consult, not a diagnosis or treatment plan.
A stye (hordeolum) is an acute inflammation of an eyelash follicle or nearby oil gland, often presenting as a tender, localized bump. A chalazion results from blockage and chronic inflammation of a meibomian or other eyelid oil gland, producing a firmer, usually painless lump. Both cause eyelid swelling but arise from different processes.
Styes typically begin suddenly with pain, redness and a small pus-containing spot near the lash line. Chalazia tend to be rounder, firmer and develop more slowly without prominent pain. Both can cause tearing, mild irritation or occasional blurred vision if large; sudden vision changes or rapidly spreading swelling are more concerning.
Diagnosis is usually made by a physical examination of the eyelid and medical history. Many people first see a primary care physician or family doctor; persistent, recurrent or problematic cases are referred to an ophthalmologist (eye specialist). Dermatology or infectious disease specialists may be involved when lesions are atypical, recurrent, or when skin or systemic conditions contribute.
Good eyelid hygiene, careful makeup and contact lens practices, and avoiding rubbing the eyes can reduce risk. Seek prompt medical attention if you notice rapid growth, increasing pain, fever, sudden visual change, or redness spreading beyond the eyelid. For emergencies, follow local urgent-care guidance or emergency services.
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