Lemna Hui is also known as Gua Zi Jin, which is effective in suppressing cough, resolving phlegm, activating blood circulation, stopping bleeding, as well as calming the mind and detoxifying the toxin. Clinically, it can be used to treat related diseases, such as patients with cough, coughing phlegm, the amount of phlegm is relatively large, as well as gastrointestinal bleeding, bleeding in the stool, vomiting blood, as well as insomnia and difficulty sleeping, these can be treated. It can also be used to treat sore throats, as well as poisonous snake bites and bruises, which can be treated with Lemna. The medicine can be boiled in soup and taken internally, or crushed and applied externally, and is clinically effective in the external treatment of intractable skin diseases, like carbuncles and sores, as well as ringworm, all of which are effective.