Device and method for controlling treatment for a skin condition using a tracer

A device and method for treating a skin condition is provided. The device may include an applicator arrangement applying a composition to skin. The composition comprising an active ingredient for treating the skin condition and a tracer. The device may also include a detector arrangement obtaining image data corresponding to an image of an area of skin. The device may further include a processing arrangement analyzing the image data to determine whether an artifact corresponding to the skin condition is detected at a location within the imaged area of the skin and to determine an amount of the tracer detected from the location, the processing arrangement directing the applicator arrangement to apply the composition to the location when the artifact is detected and the amount of the tracer is less than a predetermined threshold level.