Hi for the past week and a half I have had a sore gum behind my last lower molar. All of my Wisdom teeth were removed years ago. It is sore on the inner side of the gum and sometimes hurts when I swallow on that side. It has also been mildly bleeding . I have been taking amoxicillin for four days and had noticed a small difference. It is not red or swollen, it just feels soft to touch and the other side is hard. Thanks
What you are describing sounds typical of an authors ulcer or canker sore.  You can get them from multiple reasons including trauma, stress, changes in diet etc. I recommend giving it 10 days to heal and if the problem has not resolved by then, see your dentist.  You could also have a periodontal or tooth infection in that area. Good Luck