A system comprising: a mobile device, comprising: a camera configured to capture multiple images of a subject； a processor configured to identify a first image of the captured images as a blue frame, wherein the image was captured while the subject was illuminated by blue light, and identify a second image of one of the captured images as a white frame, wherein the image was captured while the subject was illuminated by white light； associate the blue frame with the white frame； detect a feature depicted in the blue frame that is not depicted in the associated white frame, indicate the detection of the feature to a user； and a user interface display configured to separately render the blue frame and the white frame.
