Hello
thanks for the concern
Your history that long standing,liquid filled bubble under the tongue seems to be indicative of a RANULA.which is one of the abnormalities seen in the floor of the mouth/tongue.
So this can diagnosed with clinical evaluation and Xray of the region . so need to consult an oral surgeon for diagnosis and removal of the same. Nothing to worry much this is acurable thing. Take care.
Hope i have tried to clarify your problem.

hi lucy
you havent mentioned your daughter's age.The red color of the swelling indicates she might be having a vascular malformation which is developmental in origin.these may be present at birth or may appear soon after birth.They grow in size as the child grows .these can enlarge n result in fatal complications due to bleeding.you need to get an ultrasound or CT scan done to confirm the diagnosis.

if it is the colour of the adjacent tisssues or it has a light bluish translucent hue then it could be a ranula...you need not worry much about it

visit a maxillofacial surgeon as both require surgical intervention

Dr Geeta Sharma
max fac. surgeon

Hello,

Please don't rupture it & take care of it.
It might be some vascular abnormality (hemangioma) or mucous extravasation cyst (ranula). But the red colour as told by you is indicative of hemangioma.
Please get an MRI & aspiration biopsy done to have the correct diagnosis on prescription of a Dentist/Oral Pathologist in your area.

Hope this helps.
Hope she get well soon.

With Regards,

Dr. Himanshu Govil
Gurgaon