Hi Sorry it took me this long to come back to you...
For the castor oil, I soaked a small washcloth on it put it over the inflamed node then placed a hot water bottle over it.
If you do not have a hot water bottle, just warm the oil slighlty before applying. Try to keep warm for as long as possible so maybe place some food wrap over it, then a towel, or wet a hand towel, place in a zip bag and use as that over the oil soaked washcloth to warm it up.
Post your results, this was a scary episode...
I hope this works for you...
MadArt (ist)
PS: You should post again maybe to Invincible, she's is extremely knowlegeable and her instructions indelibly clear.