A new report in Pediatrics investigates an increase in nickel allergies that may be linked to the iPad, the Washington Post reports. The article cites the specific case of an 11-year-old boy with a rash. His skin tested positive for nickel, which doctors traced back to a 2010-vintage iPad “he had used with increasing frequency the past six months.” After using a case, his rash “significantly improved.” Very little has been…