Redness of the eyes when using dandelion hot compresses on the eyes is usually caused by improper heat application methods or allergic reactions. Improper hot compress method: for example, the temperature is too high, or the eyes are damaged due to forceful pressure, which may cause redness in the eyes. Allergic reaction: hot compress dandelion on the eyes will have some direct contact, easy to induce an allergic reaction, resulting in local vasodilatation, will be red, but also may be accompanied by conjunctival edema, skin edema, eye itching and other symptoms. Therefore, it is not recommended to use dandelion hot compresses on the eyes by yourself, there are eye diseases should be timely medical treatment, and under the guidance of the doctor. If the symptoms of redness in the eyes, immediately stop the hot compress, and promptly seek medical attention.