A method for evaluating skin conditions on a skin area of a user using an ultraviolet light device that can connect to a mobile device and a user input is disclosed. The method for evaluating skin conditions includes the steps of illuminating the skin area of the user with the ultraviolet light device operated by the mobile device, capturing an image of the illuminated skin area with an image capture device, processing the image with a processing program to determine the level of fluorescence on the skin area, and mapping progress of treatment of the skin condition based on the processed image compared to a control image.