The present invention is of an apparatus and method for enhancing skin, muscle and nerve stimulation and controlled delivery of an active substance to a subject's skin. Moreover, the present invention is of an apparatus, featuring a combination of a stimulating device and an exothermic heating source. Preferably, the stimulating device is an iontophoretic device, or an electrical stimulation device, such as, but not limited to TENS, IFC and GC devices or a combination thereof. The present invention also provides a method of using such an apparatus for enhancing skin, muscle and nerve stimulation. Furthermore, the present invention provides a method of use of such an apparatus for enhancing controlled delivery of an active substance.