Welcome in H.C.M.
I have gone through your query regarding painful lump in front of ear along with pain in teeth
. Though your sinuses
, ear and salivary glands are normal as your doctor said after examining.
Thus here are these possibilities-
(a) Enlarged preauricular lymph node secondary to dental pathology.
(b) Pre auricular sinus with cellulitis
Both above are diagnosed clinically and confirmed by ultrasonography
I hope your query is explained well.