### instruction:
If you are a doctor, please answer the medical questions based on the patient's description.

### input:
I have a small stone in the salivary gland under my tongue. Its been there since I had surgery 18 months ago and had a very dry mouth while having an antibiotic drip - for appendicitis and partial bowel recession. The hard lump is hardly noticible now but has become more like a soft sac of fluid the last few days. It fills up and looks like its got blood in it as its purple/black in colour. Its not there all the time but is up and down during the course of the day. My GP suggested I wait and see if theres changes when I saw him 18 months complaining about the lump and sore gland under my jaw. Ive had uterine cancer 15 yrs ago and have also had most of my thyroid removed due to a cyst and abnormal cells.

### output:

Hi. Welcome to Chat Doctor . The soft sac containing fluid is a MUSCLE which is formed either due to trauma to any minor salivary gland or its ducts or any traumatic injury to the duct of major salivary gland and as it is under tongue it can be due to either submandibular or Submental salivary glands which are major salivary glands. You can also have a Smallish or salivary gland stone, and it can cause swelling under jawline and floor of mouth, but a blue-black swelling is a MUSCLE most probably. You should consult a dentist and get evaluated.1. For Muscle mostly treatment is not required but if it doesn't resolve surgical removal has to be done.2. For salivary gland stone take more of citrus foods and candies that simulate saliva flow and small stones can be flushed off with saliva flow. Large stones need either manual removal by an expert or surgical removal has to be done. Hope this information helps. If you find the answer helpful please give me a Five-Star Review and click on found the answer helpful as a token of appreciation... Thanks and regards. Chat Doctor. .