Rinse a few time
s a day with warm salted water. It can coat the ulcer and aid in healing
. There are also over the counter peroxide rinses that you can try. These are available in most drug stores.
If the lump is not open, or does not appear white if you look at it, and does not clear up in the next couple of days, you might want to have it checked out by a doctor. Sometime
s a lump like that can indicate an infection or a blocked saliva duct.