LMX 4% Topical Anesthetic Cream contains 4% 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.;Do not put L. M. X. 4 in your mouth, nose or inside the ear. Be careful not to get any in your eyes.