This is usually caused by one of the glands on the eyelid becoming blocked or inflamed and the waxy secretion builds up and becomes infected. They usually shrink without leaving a trace. Hot compresses can help in the early phases. Sometimes the lump persists and typically can swell up and then reduce in size but never go away completely. Should this be the case a small opening made from the inside of the eyelids will resolve the problem. However the causes of lumps on the eyelids are many and diverse and it is advised to have them checked out.