Hello I am Dr Ravinder Sharma ENT surgeon
On the basis of information provided it appears there is a infected cyst
on the lateral border of tongue. As the infection settles it become painless. I would advise you
1. To send a picture of the lesion so that I can help you further
2. Plan a visit with a ENT surgeon. My suggestion is to get it excised and send the operated specimen for histopathology. This will be the best way to deal with it. Rest of the treatment will based on the report of histopathology.
I hope this answers your concerns. Feel free to contact me if your need more information on this
With warm regards