So I never had a cyst in my life. I have constant blackhead breakouts in my mid-30s, as a teen I was zit faced...but they would come and go all over my face. I started using castor oil as a "hair gel" a couple years ago, and around the same time a cyst appeared on my scalp. I thought nothing of it. 2 years later it's still there, need to drain periodically, but I now have dozen cysts mostly on head and chin. I think there's a correlation there for me so I stopped using Castor oil recently.
Perhaps the hot pack with castor oil helps, since heat makes it thin, potentially absorb into skin and into cyst liquid, and possible then leads to body eliminating to foreign fluids. Being natural and safe, that may be mechanism for you to try. I'm not sure. But do NOT use castor oil without heating!! It will make it worse...for me, it was the cause of it!!