A canker sore is a small mouth ulcer that can appear on the lips, inside of the mouth, or the tongue. It can cause pain or numbness and sometimes a tingling sensation around the immediate area.

Menthol and camphor have a cooling or tingling effect that may feel soothing at first but can lead to further irritation. They are known to eventually strip away natural moisture, causing lips to ...

"Many people feel itching, burning or tingling around the lips for a day or so before a small, hard, painful spot appears and blisters erupt," says Chun Tang, MRCGP/DFFP, a general practitioner at ...