Mucocyst

Sometime in Oct, we noticed there's a small growth under SY's tongue. We thought it was ulcer, so we didn't really bother. Just applied honey, but it did not go away. When it grew abnormally large after approximately 1 month, we got worried and took her to see the PD. He told us it's not ulcer, but mucocyst and suggested us to see an ENT right away. He warned us there's a need to remove it thru a minor operation. 

I searched the web, and found some info on this. It's not as scary as we initially felt (sources  from here). 

mucocele (MYOO-koh-seal) is a swelling in your mouth. It can happen when a salivary gland is injured or blocked. 

You have many salivary glands in your mouth. They secrete saliva. Saliva is made of water, mucus and enzymes.

Saliva moves from a gland into your mouth through tiny tubes called ducts. Sometimes, one of these tubes is cut. The saliva pools at the cut spot and causes a swelling, or mucocele. These swellings commonly occur inside the lower lip. They also can be found in other places inside the mouth, including the roof of the mouth and the floor of the mouth.

Swelling also can occur if one of these tubes is blocked and saliva backs up in the tube. If swelling occurs because the submandibular duct is blocked, the mucocele is called a ranula. A ranula is quite large and appears under the tongue.

When we went to see the ENT, he brushed off our apprehension. It's not dangerous at all. The most, it might make her feel uncomfortable. He wouldn't encourage operation, but asked us to apply this gel instead. The gel will make her feel sticky, but SY co-operated willingly as she didn't want to go for operation. 

After about 1 week, she's healed!