Can you tell me about allergy to lidocaine?

Anesthetic allergy: Allergic reactions to Lidocaine and other local anesthetics are fairly unusual and very rarely serious. Most "reactions" turn out to be a toxic reaction due to dose or inadvertent injection into a blood vessel. Allergy skin testing is available to Lidocaine and an allergist can perform this. With different classes of local anesthetics, it is usually pretty easy to find an acceptable substitute.