1. A method of comparing at least two images of a suspect area on a patient, the method comprising: providing at least two images of the suspect area; digitally overlaying the at least two images; performing a best-fit transformation of one image to encourage the one image to approximately correspond to at least one detected attribute of the other acquired image; comparing the at least two images to determine whether a difference exists between an aspect of the one image when compared with the same aspect of the other image.