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Hello there – from your description in the photos it appears that small sharp object has become embedded in the tissue possibly during eating. It also sounds similar to a small spicule a bone that has worked its way out of the gum tissue. But the latter would happen only following an extraction. I would recommend calling your dental office. Most offices have emergency phone numbers for treatment. It would probably be wise to have a dentist look at the area and remove the small hard piece of material to accelerate healing and get you comfortable sooner. Please let me know if you need additionalinformation to answer your question. Be well – Dr. Shernan
Hello –. If you don't recall injuring the area during eating then it is likely a small piece of bone working it's way out of the tissue such as bone sequestration or a spicule. It begs the question why did this happen spontaneously. But regardless it would be wise to have a dentist remove the piece of material to promote healing. Please let me know if you need additional information to answer your question. Otherwise apposite rating would be much appreciated. Be well – Dr. Shernan