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It can be a chalazion, a blocked duct of an oil gland in the eyelid that causes painless swelling.
If it is not causing any problem, it may improve with time, however otherwise it can be treated with a minor surgery,
You can read more about it here
Hot fomentation can help in resolving the swelling.
Of course, since I cannot actually examine you, this is an educated guess, confirm the same with your doctor and follow the treatment instructions,Warm regards