Side Effects of Phthalide CreamA few patients may experience an allergic reaction, while some others may experience an itchy irritation. The allergic and itchy irritation reactions that occur with phthaloin cream can lead to a tingling sensation of redness and pimples on the skin. The site of the medication may also appear burning sensation, localized redness and swelling, then immediately wash the phthalide cream with warm water, do not use it again, if the allergy, redness and swelling is serious or immediately seek medical attention. Phthaloin cream is a kind of antiviral drug, which has an inhibitory effect on the virus of blisters and herpes simplex, and can treat diseases caused by superficial fungal infections, such as ringworm. It should not be used by breastfeeding women or children. Allergic people should use it with caution under the guidance of a doctor.