Hello
Can you please mention is it soft to touch?or hard?
Even if it is because of the continuous biting between upper and lower last molars,the outer border is now looking inflamed.So ongoing infection or trauma cannot be ignored.
Next Steps
Please consult a specialist a maxillofacial surgeon or a periodontist.Clinically this area is to be evaluated.
Health Tips
This impacted last molar is difficult to maintain,it is causing food lodgement in that region which may increase swelling or redness.
So after thorough clinical and radiographical examination,get this impacted molar extracted.