The present invention relates to a blue light - therapy device for the light treatment of the skin, comprising a flexible sleeve (1), into which a light emitting diode arrangement (2) is embedded. By means of cooling channels (7), through which a cooling fluid flows, is the light emitting diode arrangement (2) so that it can be cooled. Outlet nozzles (10), the of the cooling channels to the treatment side (3) of the collar (1), allow during the use of the blue light - therapy device, an additional active cooling of the treated skin area, wherein a macroscopic surface structure (6) on the treatment side (3) the uniform escape of cooling fluid from the outlet nozzles (10) permits.n="15"
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