Hello, You could have a related dental condition and be exploring some areas of normal anatomy. Can you recall any trauma to the floor of your mouth? A sore spot or ulceration may develop. Rinse with warm salt water, avoid acidic and spicy foods and apply a benzocaine gel if very sensitive. This could be viral and needs time to heal. Anti-inflammatory medication such as Tylenol, Motrin or the anti-histamine Benadryl may reduce swelling. This condition will heal in less than a week You may have an abscess from a tooth draining into the floor of the mouth. Anti-inflammatory medication is recommended. You would require a dental appointment for a diagnosis, treatment recommendations and an antibiotic prescription such as Amoxicillin. Monitor for changes. A clinical exam is recommended. Seek care immediately if condition worsens and does not improve. A routine dental exam is recommended with an x-ray of the sensitive teeth. If teeth along the gum line experience mobility, develop a bubble on the gum line, you can not apply pressure, have increased heat sensitivity or have additional gum inflammation, you most likely have an abscess. Here are some typical conditions in the floor of the mouth: -swelling from abscess - tooth or periodontal -swelling from Salivary gland or duct -swelling from blood vessel or collection of vessels -hematoma -sore or ulceration -cyst -tumor -hard calcification in blood vessel or salivary duct -lymph nodes -exotosis or tori -muscle frenum Thank you for your inquiry. I hope you will feel better soon. Additional questions are welcome. I am glad to assist you and hope my answer is helpful.