The effect of bitter ginseng in treating eczema is relatively good, but it needs to be treated by differentiation and typology. Bitter ginseng is suitable for damp-heat eczema, which is characterized by redness, vesicles, oozing and crusting, accompanied by a red tongue, yellow and greasy coating and slippery pulse. The oral treatment can be combined with the formula for clearing heat and removing dampness, which is composed of gentian herb, scutellaria, daqing leaf, gypsum, poria and so on. When used externally, it can be combined with the Cang Shuan lotion, which consists of Cang Er Zi, Di Shen Zi, Alum and so on. Bitter ginseng is not suitable for spleen deficiency eczema and blood stasis eczema, and a spicy and stimulating diet should be avoided during treatment.