<s>[INST] hi i had a right rear molar extracted about 3 years ago and in its location a hard lump or protrusion has appeared in the last week that is painful. Can this be a piece of bone the was left over from the extraction or a abscess .? Should i take any over the counter meds until I can afford to go to the dentist in about 2 weeks. Also what would be the most likely treatment for either? [/INST] Dear friend.Thanks for sharing your concern.The hard lump that you are experiencing over the extraction site could be definitely a bone piece or an out growth called exostosis.It is better to get it clinically examined to avoid any cyst or tumor developing there.you can take pain killer for the time being but please see your dentist soon.Also do warm saline rinses every day until you see your dentist and maintain very good oral hygiene.Hope it helps.Thanks.Take care. </s>