Dear 123hlp123: Your topical lidocaine jelly is not likely to make your fiance fail his drug test for methadone. I am sorry to hear that he is being incarcerated due to a failed drug test. Uses: Petroleum Jelly is approved for Rash and Diaper Rash and is mostly mentioned together with these indications. Our data suggest that it is taken for Eczema and Acne, although it is not approved for these conditions*. Doctors give trusted answers on uses, effects, side-effects, and cautions: Dr. Sibert on xylocaine jelly uses: If the herpese is causing shingles, then yes it can help, but if its herpese 1, taking a prescription from your doctor can help fight the virus and your body will heal the sores. What is Lidocaine? Topical Lidocaine cream contains a concentrated amount of Lidocaine along with ‘carrier’ ingredients. The carrier ingredients usually consist of petroleum jelly, natural oils, and any vitamins unique to the formula. This latest sore won't go away and the itching of my ENTIRE genital area is driving me insane! I'm using lidocaine hydrochloride jelly 2% but the relief is minimal and I'm up all night from it. Its molecular formula is C 14 H 22 N 2 O • HCI and its molecular weight is 270.80. Lidocaine HCI 2% Jelly also contains hypromellose, and the resulting mixture maximizes contact with mucosa and provides lubrication for instrumentation. Do not apply substances such as petroleum jelly, gasoline, lidocaine (Xylocaine), etc., to the tick. Do not apply heat with a match or hot nail. Do not use a twisting or jerking motion to remove. Petroleum jelly tends to trap heat and the benzocaine and lidocaine can cause the skin to feel irritable. The best defense against sunburns is to protect yourself with proper clothing and use sunscreen lotions. Lidocaine jelly is also used to numb and treat inflammation of the urinary tract (urethritis). Lidocaine is a topical anesthetic that numbs mucus membranes. It does not work to numb thicker skin. Uses: Petroleum Jelly is approved for Rash and Diaper Rash and is mostly mentioned together with these indications. Our data suggest that it is taken for Eczema and Acne, although it is not approved for these conditions*.