Hard palate and lower lip canker sores. Speedy remedy?

Need to see dentist. Canker sores do not typically occur on the hard palate. You have something else, perhaps a herpes infection or something else. See your dentist about this asap for an evaluation.
Many? Since we do not know what causes canker sores, the remedies are many. One approach is to apply a topical broad-spectrum antibiotic a few times a day. Another home remedy is to apply table salt on the sore itself but do realize this may hurt a bit. I am sure there are many other remedies but none has been scientifically proven.
CAUSE. Need to see a dentist for exam and history. Need to determine the cause, if possible, and to avoid the triggers if discover some of the reasons why you get them-.