When used incorrectly, peppermint essential oil can be irritating. It should always be diluted before being applied to the skin. In the case of this mint lip balm, it shouldn’t be drying. Instead, the wax and oils create plenty of moisture while the peppermint gives a cooling effect. Not everyone is well-suited to peppermint oil. The cooling and tingling sensation will promote blood circulation and give a plumping effect to the lips. However, those with sensitive skin may want to avoid using peppermint oil, especially those with dermatitis and eczema. Stop using the lip balm if it causes any irritation.