I like to make a poultice and attach to the area for as long as possible. We often take an old sock, cut a hole in the bottom and slide it over the poultice to keep it in place. I have been known to sleep with this on. The longer the herb can be connected to the area the better (as long as there are not open wounds-do not put comfrey on an open wound).

To make a poultice, my favorite is to pulverize the fresh root in my vitamix. But I have rehydrated dried leaf and had it be quite effective as well. Either way put the fresh root, fresh leaf, or rehydrated leaf into a blender, add a little water just to moisten, you want this to be a paste that you can spread onto a cloth. You can add a thickner if needed as well, powdered marshmallow root, corn starch or arrow root will work. Once you have blended this spread onto a cloth and attach as above. I usually make a bunch of these and put them in the freezer for later use. I learned to make these at Ravencroft Garden in the Seattle area, over a decade ago and am very grateful. They have helped immensly when I have sprained or strained something.

Blessings
Linda

I would agree that comfrey is a great healer!
In the San Francisco bay area it grows like the weed it is. you can't kill it or transplant it without it returning aggressively, which is terrific (for some people like me who use lots of it). When it is in full flower I like to dig up a substantial root chunk and use the entire plant in a poultice, root+leaves+flowering tops. I smash it up with a mortar & pestle or in the food processor with a little bit of apple cider vinegar for ease of blending and to help the pH be more acidic for better skin absorption. I use this mixture as a fresh poultice and, like Linda, like to make a frozen poultice as well - by spreading the pureed comfrey onto a sterile gauze, wrapping the block in plastic wrap and then freezing it, or by filling up one of those paper cone water-dispenser cups from ages ago with the mix and then freezing it. with the paper cone, you just peel away the edge as it melts, and you don't get too messy.