dermatologist laura faris conducted a study on the accuracy of several apps for mel la noam may detectionthem were automated and gave back an answer right away. >> reporter: the best one missed 30% of melanomas. the worst one missed 93%. while the apps say they're for educational purposes only, faris is concerned customers could rely on them. >> you shouldn't trust diagnosis of cancer to something like an app that doesn't have data to back it up. >> reporter: as for mole detective, its representatives told gma investigates that the company settled because litigation was too costly and the ftc's claims were unfounded. the marketer for malapp could not be reached for comment. both apps included disclaimers advisings users to see a physician for any concerns and for regular checkups. mara schiavocampo, abc news, new york. >>> and both the mole detective and the mel app are no longer available. how scary is that? >> a good time to the moles and make a dermatology appointment. sometimes you don't see the stuff on your back necessarily. they say try to check it out once a year. >> go to a human