Here is a place to get the salve cheap, it is for horses BUT it is the same thing and really inexpensive. I would be careful with it and spot test yourself to see what immune responce you do get.
Horse Wound Care: Equine Ichthammol (20%) Drawing Salve by Neogen
Seeing that this is supposed to be for HORSES if at any time you crave oats or hay discontinue use!!!!!