I used just castor oil not even on a pack. Just repeatedly applied it throughout the day maybe 4 times or more depending on when I went to the toilet. My cyst had got so big and infected it was going to need surgery to have it removed. It had gone solid. It couldn't be drained. I took antibiotics the doctor gave me for 2 weeks and used garlic, tea tree and salt sits baths for 3 weeks with next to no change... but pain had lessended. then I decided I had 2 options... castor oil or cbd oil. I read that also works well.
The moment I got home from being told I needed surgery I started applying castor oil and stopped the other treatments. (I was trying everything too, Apple cider vinegar which burnt me. Turmeric packs, silica and raspberry leaves. As well as the sits baths and hot flannels) I also had to deal with thrush from antibiotics which I cured with creme and natural yogurt.
Within 3 days of starting the castor oil it went down dramatically and after a week it almost went. It still hasn't completely returned to normal after but I'm in no pain and don't need surgery anymore. It's less then a pea now. Even if it stays like this it's still 100 times better then the plum size it was before. I also noticed my emotional well being had a part to play in the healing process. When emotional or over whelmed it would be uncomfortable and seemed to be inflammed again or more. But when happier and in a good energy space I seemed to heal better and faster. I hope this helps in anyways or I hope you find a remedy that works for you. Xx