1. A method for automatically identifying a person, comprising: applying white-light radiation to at least a portion of a body surface and acquiring a first white-light image at a portable image acquisition device; applying UV radiation to said portion of said body surface and acquiring a first UV image at said portable image acquisition device; generating a skin mask from the first white-light image and the first UV image; comparing the skin mask with a pre-stored skin mask for a known person to determine whether the two skin masks substantially match, and if there is a substantial match; obtaining results related to at least one skin condition from at least the first UV image; and comparing the results with pre-stored data associated with the at least one skin condition for the known person to determine if the person to be identified is the known person.