It must be mucocele, which can occur due to trauma to the minor salivary glands on the lip. Kindly consult a dentist
in person for further suggestion. We need more investigations to decide upon treatment. You may need surgical removal. You may consult me in person. Dental tips: - visit a dentist every six months. Gargle your mouth thoroughly after every meal. Scrub gently to clean your tongue with a tongue cleaner. Floss all your teeth inter dentally & brush twice daily, morning & night, up & down short vertical strokes, with ultra-soft bristles, indicator brush.