That’s interesting and I sure can’t see any harm an trying it. https://draxe.com/nutrition/castor-oil/. Outside use for our water fowl.I'm also dealing with bumblefoot (if anyone has time to read my most recent post https://www.backyardchickens.com/threads/why-is-my-duck-limping.1385811/#post-22821449 I'd really appreciate any help!), and it occurred to me last night to ask if castor oil has helped anyone? I've experienced cysts on my own body and have treated them successfully with it, but I can't find anything convincing for bumblefoot via basic internet searching.