★★★★★
Having badly sprained an ankle and had to walk on it for a mile or so, at the first opportunity, of course I raised it and applied ice without any noticeable diminution of pain. I couldn't move my toes and the pain was excruciating right up to and beyond the knee. Application of a paste made from several large comfrey leaves, liquidised with water and flour to make a fairly stiff, spreadable compress, held in place with Cling Film and an elastic bandage, seemed to provide very effective relief within a couple of hours.
It was removed overnight for convenience but replaced next morning when the pain had returned and again seemed to reduce that pain very quickly and effectively.
I wouldn't normally post a remedy after only one trial, since coincidence and placebo effects may play a part but I'm not planning to have another sprain. I am convinced the comfrey took down the pain extraordinarily quickly.
Traditionally known as Knitbone, the roots of Comfrey are said to be even more efficaceous than the leaves. I've also read that the ankle can be soaked in an infusion of comfrey leaf or root. I haven't tried these methods.
Comfrey is, however, a potent liver toxin so shouldn't be taken internally or applied to open wounds.
I should also add, as a caveat, that after 2 days of use, I've noticed a bit of a tic on the fingers on that side, which may or may not be coincidence, may or may not be related to absorption of the comfrey; or may be related to insult to the nerves, due to the accident.