Hello, You have the possibility of a retained root being exposed. This may feel like a splinter in the gum. You may feel a hard structure that has some mobility. Removal by your dentist should be a simple procedure and offer relief. Use of a benzocaine gel may offer tempoaray relief. Rinse the area well with warm salt water and take some anti-inflammatory medication such as Tylenol or Advil. Another possibility is trauma that has caused tissue damage that is now infected. An ulcerated lesion may heal by itself. Avoid all irritants including smoking, alcohol, spicy and acidic foods. Again, warm salt water rinses and antinflammatory medications may offer relief. Antibiotics or anti fungal treatment may be needed if there is a bacterial, viral or fungal infection present. Make sure that you consult your dentist if the area does not improve with the suggested methods or increases in discomfort. Continue to monitor the area. There is a possibility of a systemic disease or lesion that needs further evaluation such as a biopsy. Your dentist will perform a clinical evaluation and recommend treatment for your condition. An xray evaluation can show any changes in the bone. Make sure to keep well hydrated. Take vitamins and avoid deficiencies with a well balanced diet. A softer diet is recommended until the area heals. Inspect your denture for buildup or signs of wear. An illfitting denture may irritate tissue and make you prone to a fungal infection. Overall gum discomfort with redness may be an oral yeast infection and require nystatin medication. Thank you for your inquiry. I hope your discomfort will decrease with my recommendations. I am glad to assist you further.