Sorry for butting in: You might want to look at Cayenne Pepper as well as:

http://www.harmonikireland.com/index.php?topic=cayenne


http://www.herballegacy.com/Gangrene.html

if it were me this is what i would do
Gangrene
The treatment of gangrene calls for blood cleaning and liver herbs to be taken internally, while using "herbal hydro-therapy" on the afflicted body parts.
Internal herbal formula for gangrene
White Oak (Quercus Alba) has deep tissue cleansing action
Red Clover (Trifolium Pratence) blood cleaner
Milk Thistle (Silybum Marianum) protects and heals the liver
Bilberry (Vaccinium Myrtillus) improves circulation
Plantain (Plantago Major) cleans blood
Herbal Hydro Therapy for Gangrene
Prepare a herbal bath, of the following herbs, large enough to cover the entire afflicted area, it must be as hot as the patient can stand it, without burning the skin. The patient must soak the afflicted part in the hot herbal tea for 15 minutes, then soak the afflicted part in very cold water for 5 minutes. This process must be repeated (hot/cold-hot/cold) four times, do this three times a day. While taking the internal gangrene formula three times a day.
Herbal Hydro Therapy Formula for Gangrene
6 parts Marshmallow Root (Althaea Officinalis)
1 part Ginger (Zingiber Officinale)
1 part Cayenne (Capsicum Frutescens)