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Burns on the face, arms and hands that require skin grafts. Acne boils and ugly rashes. Black hairy tongue and other oral lesions. [...] Faulty or malfunctioning e-cigarettes can overheat and either explode or burn to the touch, said senior study author Dr. Kurt Ashack, a dermatology resident with the University of Illinois at Chicago.

"It could cause a pretty significant burn, where you lose at least the top layer of skin, if not more," he said. Device explosions also have caused people to lose teeth, the findings showed.