Make the comfrey oil.Combine the comfrey oil, beeswax, vitamin E oil, and lavender essential oil in a pot.Heat the oil mixture over very low heat until the beeswax melts.Once the beeswax has melted, dip some out with a spoon, and put the spoon into the freezer for about 5 minutes. Then test the consistency. If it's thick enough for salve, you can pour the oil mixture into jars. If not, add a bit more beeswax.Keep testing the salve until you like the consistency.Once you have it just right, pour it into jars.As the oil cools, it will firm up. After it's totally cool, put lids on the jars and label them.Store the salve in a cool, dark place, and it will stay good for months.