Salonpas® Lidocaine Pain Relieving Flex Patch is made from a stretchable, thin fabric with strong adhesion that adheres as you move, stretch, or bend. Salonpas Lidocaine Pain Relieving Flex Patch is the latest innovation from the world’s leader in medicinal pain patches. It provides temporary relief of pain associated with back, neck, shoulders, knees and elbows. Salonpas® Lidocaine Pain Relieving Flex Patch is not indicated for post-herpetic neuralgia.