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An app a day keeps the doctor away — but only if the app is SpotCheck, a mobile service that allows users to take photos of suspicious-looking moles and submit them via iPhone or PC to a board-certified dermatologist. Responses come within 24 hours. If the mole is deemed atypical, SpotCheck also provides a list of local dermatologists you can visit in person. Free download, $5 per submission, www.spotcheckapp.com