Along with general root treatment and local treatment, I used Ja Teishin which sucked up stagnated energy from where it was placed. I searched the place where energy was stagnated. The place was exactly above where a canker sore was located. I placed Ja Teishin at the point. Ja Teishin worked as a chimney discharging stagnated energy from the other side instead of smoke. Once I didn't feel any stagnated energy coming up, I took off Ja Teishin from the point.
I did the same thing at a few points on the cheeks. After 3 treatments, it started to get better dramatically. At the beginning, he didn't believe it got better by acupuncture because he was still taking medications as well, but dramatic change made him believe it got better by acupuncture.