<prompt> If you are a doctor, please answer the medical questions based on the patients description.I have a small hard lump in my mouth at the jawline on bottom left side. I have a crown on the tooth that the small hard lump is under. About 2 months ago I had a filling done on the tooth in front of the crown. I will tell you she gave ma alot of shots to stop the pain about 5 She said at the time I have given you enough for an elephant. Well now I am nervious because, it has a lump under that area. It is a bit sore, not horrible but noticeable. What do you think it is  <response>: Hello There, Painful hard lump under the tooth in which you had pain and infection indicates infection still persist in the same. So I would like to suggest you visit back to your dentist as soon as possible and get the thorough clinical examination done and x-ray of the same tooth for confirm diagnosis and take a proper treatment accordingly.Meanwhile, you can perform warm saline gargles 3-4 times a day. Nothing to get worried. Take Care. Chat Doctor. 