A device for treating a tissue portion (W), in particular a wound, of a human or of an animal, the device comprising a. an application device for applying a first composition, a second composition, and a third composition for treating the tissue section (W) onto the tissue section (W), wherein the application device comprises at least one application opening for dispensing the compositions from the application device to the tissue section (W), and b. an exposure device for exposing the compositions applied to the tissue section (W) with light, the exposure device having an exit surface for exiting the light from the exposure device , c. a carrying device , wherein the carrying device carries the at least one application opening and the exit surface , and d. a sound generator for exposing the first composition, the second composition, and/or the third composition during application to the tissue section (W) and/or a rinsing fluid during the rinsing of the tissue section (W) to sound, e. wherein the exposure device is designed for emitting light having a wavelength in a range from 400 nm to 500 nm and in a range from 800 nm to 1400 nm, characterized in that f. the device comprises a rinsing device for rinsing the tissue section (W) with the rinsing fluid, wherein the rinsing device comprises at least one rinsing opening carried by the carrying device for dispensing the rinsing fluid from the rinsing device to the tissue section (W), g. wherein the rinsing device comprises a pressure generator for supplying the rinsing fluid with an overpressure in a range from 1 bar to 80 bar above an atmospheric pressure, h. wherein the application device contains at least one exchangeable cartridge containing at least the second composition and the third composition, i. wherein the second composition is an aqueous solution of hypochlorous acid, and j. wherein the third composition is an aqueous solution of hydrogen peroxide. a. an application device for applying a first composition, a second composition, and a third composition for treating the tissue section (W) onto the tissue section (W), wherein the application device comprises at least one application opening for dispensing the compositions from the application device to the tissue section (W), and b. an exposure device for exposing the compositions applied to the tissue section (W) with light, the exposure device having an exit surface for exiting the light from the exposure device , c. a carrying device , wherein the carrying device carries the at least one application opening and the exit surface , and d. a sound generator for exposing the first composition, the second composition, and/or the third composition during application to the tissue section (W) and/or a rinsing fluid during the rinsing of the tissue section (W) to sound, e. wherein the exposure device is designed for emitting light having a wavelength in a range from 400 nm to 500 nm and in a range from 800 nm to 1400 nm, characterized in that f. the device comprises a rinsing device for rinsing the tissue section (W) with the rinsing fluid, wherein the rinsing device comprises at least one rinsing opening carried by the carrying device for dispensing the rinsing fluid from the rinsing device to the tissue section (W), g. wherein the rinsing device comprises a pressure generator for supplying the rinsing fluid with an overpressure in a range from 1 bar to 80 bar above an atmospheric pressure, h. wherein the application device contains at least one exchangeable cartridge containing at least the second composition and the third composition, i. wherein the second composition is an aqueous solution of hypochlorous acid, and j. wherein the third composition is an aqueous solution of hydrogen peroxide. <EOS>