Thanks for posting your query at DoctorSpring.com. I can understand your concern.
You seem to be having a mucocele which usually happens in individuals due to lip biting. It might happen also without any apparent cause.
The treatment would be excision or freezing the mucocele by a dermatologist.
Hope this helps, Please feel free to get back with any follow-up queries.
Patient replied :
Dr Banodkar thanks for your quick response and happy new year to you.
Best wishes to you too. Take care.