Marica: I apologize - I typed your name wrong. My fingers were going to fast. Thanks for the positive note Barb. I'm slowly calming down as the redness and swelling on the roof of his mouth are diminishing daily as he's on this antibiotic. I made the mistake and did a search on this site for lump on the roof of your mouth and that brought up several cases where cancer has occurred there. I just think I'm so stressed from my sisters situation that this was totally putting me over the edge. I wish I could be more like so many of the people on here and NOT worry until there's a real reason to!