could be a lipoma--harmless just irritating, but you should get it checked out because it is growing
Quite often uric acid will build up in an earlobe. It can be harmless - or it can mean you need to change your diet a little - try eating less red meat. Eventually you may get gout from it if the uric acid decides to collect somewhere else - like your big toe or your ankle.
It is most likely to be a cyst.
A boil forming would hurt.
If you have any concern, then see your doctor for a correct diagnosis.
Best wishes.