Canker sores are recurrent what reason be

Canker sores are recurrent what reason be

Question:

Gender: female
Age: 20
History: no
Description: always good condition and have a few days, sometimes is broken 2-3,

Treatment:

Recurrent oral ulcer and said, o KouChuang recurrent or his mouth inflammation, TCM believes that, the disease for pulmonary kidney Yin kui, asthenic-heat, when the infection to retain heat source, to eat something, as zhibai dihuang pill.