Yam is sweet in taste and flat in nature, belonging to the spleen, lung and kidney meridians, it can produce fluid and benefit the lungs, and it can tonify the kidney and astringent essence, and it can also tonify the spleen and nourish the stomach, which can be used for the treatment of spleen deficiency with low food intake, prolonged diarrhea, lung deficiency with asthma and cough, kidney deficiency with spermatorrhea and subluxation of the belt, and other diseases. There is no report that eczema patients can not eat yam, so eczema patients can eat yam. Yam is a qi tonic traditional Chinese medicine, so it should be used with caution for people with dampness (too much dampness leading to fullness and discomfort in the spleen and stomach) or those with solid evils or stagnation, so as not to stagnate the evil qi and aggravate the condition. If you need to use yam to treat diseases, it is recommended that you use it under the guidance of a doctor, and do not use Chinese medicine blindly, so as not to cause adverse consequences.