Side effects of Cyperus rotundus can cause allergic reactions such as pimples and measles in people who are allergic to Cyperus rotundus. It should be noted that the cypress is poisonous, and when it is necessary to use it, it should be used under the guidance of a professional doctor and should not be used on its own. It is a heat-clearing and detoxifying medicine, and is the whole herb of the deep green cypress plant of the cypress family. The plant is also known as the herb of the family Cyperaceae, and is also known as the herb of the leaves, Solanum. It enters the liver meridian and lung meridian. It is sweet, bitter, astringent, cool, light and warm in flavor. It has the effects of clearing heat and removing toxins (removing heat and toxins from the body), dispelling wind and removing dampness (dispelling wind and dampness from the body), etc. It can be used clinically to treat wind-dampness. Clinically, it can be used to treat rheumatic paralysis, sore throat, jaundice due to dampness-heat, swelling and pain of red eyes, mastitis, cough due to lung heat and bleeding due to trauma. It is contraindicated in people with allergic history to Cyperus rotundus to avoid causing allergic rashes and other adverse reactions. It is cold in nature and should be used with caution for those with spleen and stomach deficiency (weak and cold spleen and stomach). If necessary, please use under the guidance of a professional Chinese medicine practitioner, do not use on your own.