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 drive device is arranged to control the light emitting element to emit pulsating light with a pulse length which lies within an interval of about 60% to 90% of the time between the respective start edge of two consecutive pulses, and to vary the length of the pulses over time.
