Herbs for external draining wound?

I have a 2" long wound from the car's bumper hit my left leg, that I have to keep a bandage on because it drains clear fluid. As the swelling goes down, I think this will heal. I was told to remove the boot for one hour a day, and wash my leg with mild soap and water. Any tips on what I might do to help heal this? They say to apply Slippery Elm after the wound has closed to prevent contamination.

 Nothing compares to Slippery Elm as an emollient herb used for poultices. Dr. Christopher’s well-known poultices for abscesses, boils and even gangrene use Slippery Elm paste as a main ingredient. A paste is made by moistening the powdered bark with a small amount of hot water or raw milk. Poultices vary according to what herbs are added to a Slippery Elm paste. To avoid complications with Slippery Elm poultices, make sure the bark granules do not heal into an open wound as it closes. Sometimes it is better to use an antiseptic infusion such as a wash several times a day until a wound closes and apply the thicker poultice after danger of contamination is over.

An antiseptic poultice good for old gangrenous wounds is prepared by mixing an infusion of wormwood with equal parts of very fine charcoal and Slippery Elm powder. This antiseptic poultice is applied over the affected area and reapplied until the condition clears. Another poultice used to prevent a wound from festering takes brewer’s yeast or baking yeast stirred into Slippery Elm powder and moistened with new, raw milk. Mrs. M. Grieve’s “Compound Bran Poultice is made by mixing hot vinegar, equal quantities of wheaten Bran with Slippery Elm powder.”  It is used externally over affected areas as needed for severe rheumatism, gout, joints, synovitis, etc. Simply adding an antiseptic herb such as plantain and or goldenseal powder to a Slippery Elm poultice makes it antiseptic. It proves to be the best carrier for any herb when used as a poultice.