question: Hi, may I ansrwer your health queries right now ?  Please type your query here...I had my root canal done on the left side 4th teeth of upper jaw 7 to 8mths back, but it still had a small swelling lump above it and when pressed from outside i could feel the pain.  Now the lump n pain  had grown bigger.  the xray shows abscess between the two teeths.  a cyst is formed.  why such a thing is  developed and what would be the inexpensive treatment for it?