Lidocaine
Lidocaine is one of the common kinds of anesthetic. Though licodaine patches, and topical sprays and gels, are available, it is most widely used as an injectable anesthetic in a 2% or 1% strength solution, both with or without epinephrine (adrenaline), a vasoconstrictor.
Contrary to popular belief, lidocaine use does not increase bruising during a procedure — if anything, especially with the use of epinephrine, one of the good side-effects of this product is that it can reduce post-operative bruising.
It should also be noted that lidocaine is not a cocaine derivative, and there is no way to "distill" or otherwise produce a euphoric drug from it (although in very rare cases former addicts may find lidocaine use triggers lidocaine euphoria that reminds them of cocaine). There is absolutely no reason why lidocaine should conflict with straight-edge philosophy.
Finally, it should be noted that injectable lidocaine is, in most countries, available by prescription only or may only be administered legally by doctors. Clients should be wary of any piercing studio that offers it in these countries, although many do as a discreet service to customers seeking implants, tongue splitting, and other invasive modifications. However, out of respect for their freedom, most will insist that you not take pictures of it and not talk about it. Topical lidocaine spray or gel for mucous membranes is generally available over the counter.
Xylocaine is one of the most common trade names for this product.
Allergies
Though quite rare, some people cannot tolerate the caine group of anesthetics (such as Lidocaine, Marcaine, and others). Though extremely rare, an allergic reaction does have the potential to become fatal. If an allergic reaction is suspected, immediately contact a physician! If a person has previously been administered such an anesthetic (usually for dental work) on at least two occasions with no reaction, the chances of a future allergic reaction are negligible.