I cured it

After years and years. After blowing up to the size of a marble and very sore Its now so tiny now I can barely feel it.

Castor oil. Massaged it in at bedtime. Next morning, lukewarm bath. Massaged the cyst in the bath and it almost immediately sort of 'deflated'. Repeated the same thing over the next few days and within 4 or 5 days it's almost completely disappeared.

I'm overjoyed. I hope this works for you too.