An applicator device for moving a contact surface against a person's back includes an elongated handle and a generally disc-shaped shell formed on one end of the handle. A generally disc-shaped cap is threadably engaged with the shell. The cap can be formed with structure for brushing, massaging, or scratching a person's back, or the cap can detachably hold one of a plurality of contact pads, with each contact pad having a structure and function distinct from the other pads.