The invention relates to a massage head which comprises a housing forming an inner chamber defined by a bottom, two side walls and two transverse walls, and open on the surface thereof opposite the bottom, inside of which a skin fold is formed when the head is applied to the skin of a patient. The head is made up of two modules (50, 51) provided with means capable of allowing them to reversibly be rigidly connected to one another. Each of the modules (50, 51) includes a functional element (10) defining one of the transverse walls of the inner chamber.