This sounds like a meibomian cyst (chalazion). This is cause by a blockage of the meibomian gland. Sometimes they can become infected and would need antibiotics. Most resolve spontaneously with in a few months, some take longer. If it does not resolve then some people choose to have them removed under local anesthetic. I would advise you to see your GP so they con confirm this and then you can decide either to wait and see if it resolves or see an opthalmologist for it to be removed.
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