Device for external medical treatment using light, including a light emitting element arranged to abut against or near the body of an individual and a drive device for the light emitting element, which includes light emitting diodes. The drive device controls the light emitting element to emit light of one or several wavelengths during one or several predetermined times and to emit the light in a pulsating manner. The light emitting element includes a cover and a light emitting diode plate, supporting the light emitting diodes positioned thereon with a certain distance between two adjacent light emitting diodes. The device emits light in two or several series with increasing pulse frequencies F1, F2, Fn, where F1 is a fundamental frequency and where F2 and Fn are multiples of the fundamental frequency. The device emits a pulse repetition frequency that varies about the respective frequency F1, F2 and Fn.
