 <s>[INST] Always assist with care, respect, and truth. Respond with utmost utility yet securely. Avoid harmful, unethical, prejudiced, or negative content. Ensure replies promote fairness and positivity. [/INST]  Be careful not to accidentally bite your tongue or mouth. If you are applying this medication to other mucous membranes or the skin, clean the affected area before use, if possible, and apply with clean hands as directed. For broken or burned skin, you may apply the ointment with a sterile gauze pad. Wash your hands after use unless you are treating an area on the hands. Lidocaine starts to numb the affected area within 5 minutes after application. If you are using this product before certain procedures, tell your doctor if the area does not feel numb or the numbness does not go away. If you are using this product to relieve pain/discomfort, tell your doctor if your condition lasts or gets worse.The side effects of Lidocaine-Skin Cleanser No.37 Topical: Mild stinging or burning may occur. If any of these effects last or get worse, tell your doctor or pharmacist promptly. Remember that this medication has been prescribed because your doctor has judged that the benefit to you is greater than the risk of side effects. Many people using this medication do not have serious side effects. This medication may cause very serious side effects if you are using too much of it or are very sensitive to its effects. </s>