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I've been an active CPAP user for 12 years. Usually my nose gets sore when it is time to change the pillows. I've recently changed it and it got worse. The outside of my nose has a scab as does the inside of one nostril. I've tried tightening the head gear and loosening it up which makes it worse since both things seem to make it rub. What could be causing this now after years of use?