I have a swollen lymph noid it is right under my jaw neck region i have had it for 4 weeks and i have had blood test done it all came back normal?

Likely OK/ if tender: This depends on if your lymph node is tender/painful, as opposed to rock hard and painless. If you had nothing else, and you had no swelling of your lymph node before now, and it is tender, it is likely an infection, and should resolve. If nontender, and you have hoarse voice, non-healing ulcer, etc., you might want to see your doctor soon and get a biopsy/tests to rule out possible cancer, etc.

Need to See Dentist: You need to see a dentist and possibly be referred to an oral surgeon for diagnosis. It may be an infection (bacterial, viral or fungal), a tumor or a blocked salivary gland. Most of those would not change your blood test profiles, which are generally not diagnostic of dental problems. You need to be examined and receive appropriate treatment or referral.