Hello, Thanks for your post on HealthcareMagic. I carefully read your query and able to find out your point of concern. Dont worry it s not a serious issue to get worried. I think it is a mucocele, caused due to local trauma. Mucocele are formed by accumulation of mucous from trauma to salivary duct. Usually it is not harmful and spontaneously resolve on their own after a short time, and you can rinse the mouth thoroughly with salt water for two to three times per day for few days to augment the process. If persist for long time then you can go to a dermatologist for laser treatment or surgical excision. I think it will help you. Wish your good hralth. Regards Dr. Atique