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A lidocaine patch is designed to provide localized pain relief through the application of lidocaine, which is a local anesthetic. When applied to the skin, the patch works by delivering a constant dose of lidocaine to the targeted area, effectively numbing the surface and the tissues underneath. This action helps to diminish or block the sensation of pain in that specific location.

The mechanism of action is focused on the nerves in that area, preventing them from sending pain signals to the brain. The patch does not typically cause systemic effects, meaning it doesn't usually lead to anesthesia over a wide area of the body or affect the entire body in the way that systemic medications can. Instead, its primary purpose is to provide localized anesthesia where it is applied.

While some other methods of medication delivery might involve oral absorption or systemic relief, these are not characteristics of what a lidocaine patch is intended for. Its effectiveness lies in its ability to deliver medication directly to the site of pain, making local anesthesia the primary and correct answer for the effects achieved by using a lidocaine patch.