What is a dermaroller?
I believe you are right shiver about the size of castor oil, I don’t believe castor oil could penetrate at all without heat. I don’t know much about all this but I am guessing that the stratum corneum opens up slightly when hot to allow the oil through?
Castor Oil is used between the group of people I know with ulcerative colitis, you apply it to your stomach on a heat pad and it helps with your bowel. I found this on a site which gives me a lot of hope:
“External treatments like castor oil packs were often advocated by Edgar Cayce in his readings on Crohn’s Disease and ulcerative colitis. Castor oil is also known as palma Christi, or literally, “the hand of Christ,” because of its superb healing properties.”
May the force (of your hand) be with you. :littleguy