<s>[INST] About 4 months ago I had my sylava gland removed because of stones. Several months ago a knot grew on the roof of my mouth the size of a quarter. The dentest took x-rays and said it wasnt a tooth infection and lanced it and gave me antibiotics. Several weeks ago the lump gre back just as big. I kept pressing my toungh on it for days and awke on night with a fowl tatse and oder in my mouth. At least twice this happened and I gargled to get rid of the fowlnes. Now the lump has begun to shrink back to normal. Whats going on with me Dr. Could it be more stones that the ENT said I wouldnt get back or could it be cancer or what? [/INST] Hi Dear, Welcome to Chat Doctor. Understanding your concern. As per your query you have lump at the roof of the mouth. Well there can be many reasons for lump at the roof of the mouth like muscle, torus palatines, Tooth abscess, irritation of mucosa, smoking and sometimes cancerous condition. I would suggest you to consult oral pathologist for proper examination. Doctor may order CT scan, blood gets, biopsy and examine it physically. Doctor may further extend the course of antibiotics along with anti-inflammatory Chat Doctor.  Do not touch or press it. Hope your concern has been resolved. Get Well Soon. Best Wishes, </s>