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can develop due to many reasons like infection , trauma, inflammations , these being the most common causes. In your case I feel the tubes being a foreign body must have caused trauma or inflammation causing a cyst. We cannot exactly say it is due to thicker or thinner tube , it could be anything. changing the tubes may not be of much help , just get it marsupalised or excised by a simple surgical procedure, it will resolve then onwards.
Wish you good health