Most people throw away the watermelon rind after eating the fruit, but in fact, the rind has many uses.
In medical texts, the watermelon rind is also known as "Xigua Cui" or "Xigua Qing." The part used for medicinal purposes is the outermost peel of the watermelon. It has a mild aroma and a light taste and is an excellent remedy for clearing heat, relieving summer heat, quenching thirst, and promoting urination. It is commonly used to treat summer heat-related vexation and thirst, scanty urination, and canker sores.
A white crystalline substance made by mixing watermelon rind with mirabilite is known in pharmacology as "Watermelon Frost." It is a primary medicine in dentistry. Its functions are to treat ailments such as acute laryngitis, pharyngitis, oral sores, and dental caries. In the "Essentials for Treating Sore Throat," the "Guashuang Powder" used to treat diphtheria is a time-tested and enduring formula for throat ailments, with Watermelon Frost as its main ingredient.