Styes and chalazia are lumps in or along the edge of an eyelid. They may be painful or annoying, but they are rarely serious
Chalazia
- usually larger and may not hurt
- forms when an oil gland in the eyelid becomes blocked
- chronic and usually do not resolve without intervention
- grow more slowly than styes
- tend to develop farther from the edge of the eyelid than styes
Stye
- appears as a red, sore lump near the edge of the eyelid
- caused by an infected eyelash follicle
- Styes are caused by a bacterial infection
- acute onset and usually short in duration (7–10 days without treatment)
- when a a stye doesn't heal, it can turn into a chalazion

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