A system and method to improve sensory functions in the hand or foot by dermal topical application of a local anaesthetic substance to adjacent skin areas, using a tailored application device or kit specially designed to fit the size and anatomical shape of the body part which is to be anesthetized. The concept is to block sensory input from the anesthetized skin area hereby inducing a functional reorganization in sensory brain cortex resulting in enhanced sensory functions in body parts adjacent to the anesthetized area with focus on the hand and sole of the foot.