lidocaine and can be used to relieve pain caused by minor cuts, minor burns, abrasions, sunburn, and insect bites. Lidocaine preparations are also commonly used by physicians and other health care professionals to numb the skin prior to performing minor surgery, insertion of IV lines, obtaining blood specimens, and other such procedures. L.M.X.4 should only be used externally. Do not put L.M.X.4 in your mouth, nose or inside the ear. Be careful not to get any in your eyes.