Objective : The purpose of this study is to know the effect of Ko-Bang(古方) on nummular eczema. Methods : We decided the treatment principle through the abdominal examination and symptoms. We gave Ko-Bang to the patient and observed the progress. We used visual analogue scale(VAS). Results : After the treatment the grade of VAS was decreased and the symptoms of nummular eczema were significantly improved. Conclusion : After the treatment of Hwanggijakyakgyejigoju-Tang(黃耆芍藥桂枝苦酒湯), the symptoms of nummular eczema were disappeared and Ko-Bang was effective on the treatment of intractable skin diseases.