My left ear is stuffy and i noticed a small painfull lump in back of earlobe next to wear it meets cartilage. Also have what i think is swollen lymph node less than an inch behind the ear lump. Could this be from an ear/sinus infection? I had a lower tooth abcess almost a year ago and had a root canal. It was severe and i have a check up next month to make sure the bone is healing. It caused a huge hole in my jaw. Being a bit paranoid that it coukd be related.