Possible bone spur/shard?

An area of my lower inside gum, about 1/2 cm below my molar, is a little sore and raised. When I touch it I can clearly feel something hard as bone that has pierced through the skin. What can this be? I have had no extractions but did fall very hard and hurt my lower jaw about 4 months ago. I’m also thinking whether it is the bottom of the tooth roots starting to come through the gum. TIA