A wearable device for therapeutic irradiation of skin may comprise: a light source optically coupled to a light spreading sheet and electrically coupled to a controller configured for controlling the intensity of light emitted from the light source and the duration of emission of light from the light source during a therapeutic session a proximity sensor for detecting proximity of the light spreading sheet to the skin, the proximity sensor being attached to the light spreading sheet and electrically coupled to the controller and a power source electrically coupled to the light source and the controller wherein the controller is further configured to turn on, and keep turned on for the duration of the therapeutic session, the light source when the proximity sensor detects proximity of the light spreading sheet to the skin. In embodiments the light source may comprise an array of light emitting diodes attached to a substrate.
