The herb works by stimulating regrowth of normal connective tissue that underlies the skin. The active constituent appears to be asiatic acid. I'd suggest using one of the standardized extracts of gotu kola that are sold here. To use the extract externally, soak a cotton ball in the liquid and wipe it over the affected area. Make a tea following the instructions on the package or bottle.
Tea contains many of the same compounds that are found in dragon's blood.
It's antiseptic and astringent and helps promote skin healing. You can have a cup of tea and then lay the moist, spent tea bag on your sore. Because everyone is different, a physician must diagnose conditions and supervise the use of healing herbs to treat individual health problems. Herbs and other natural remedies are not substitutes for professional medical care. We urge you to seek the best medical resources available to help you make informed decisions.