I've been looking into these topical anesthetics a bit and though I'd share what I found. Perhaps its of interest to others.
I found a couple of journal papers that make for interesting reading. There's quite a lot about the dangers of these anesthetics. I get the overall impression that some of these anesthetics are dangerous with certain medical conditions, the difference between a safe level and dangerous is not very large, and that's if you're not careful its relatively easy to use too much. Whats safe would vary from person to person, but these products are supplied where everyone who uses them is safe. It probably explains why electrolysis hurts so much as well. There's anesthetics that will fix that, but then you'd be in a hospital under the care of an anesthesiologist for the duration. That's well out of my price range.
Topical Anesthetics for Dermatologic Procedures: A Review
JOSEPH F. SOBANKO, MD, CHRISTOPHER J. MILLER, MD, AND TINA S. ALSTER,MD
Published in American Society for Dermatologic Surgery in "Dermatologic Surgery Journal"
http://www.ncbi.nlm.nih.gov/pubmed/22243434http://www.skinlaser.com/wp-content/uploads/2011/07/2012AnestheticReviewDermSurg-AlsterSobanko.pdfReview of Lidocaine/Tetracaine Cream as a Topical Anesthetic for Dermatologic Laser Procedures
Pain and Therapy Journal, April 6, 2013
http://link.springer.com/article/10.1007%2Fs40122-013-0010-2These papers talk about some topical anesthetics banned by the FDA. Here's one of the letters
http://www.fda.gov/ICECI/EnforcementActions/WarningLetters/2006/ucm076195.htmI was interested in the one with DMSO as it sounds like would be very effective as part of an anesthetic, but it doesn't say much. I didn't find anywhere it was available as part of an anesthetic either. DMSO itself is not overly dangerous (or hard to buy), but mixing it with other things can be.
The one bernadette found looks to be on the upper end of things. I'd certainly use it, but I'll be re-reading these papers before I use any topical anesthetic. I'm overly cautious.