On the left bottom side of my mouth behind my back molar is a yellow hole. it's swollen and hard. my whole jaw hurts. is it a sore or wisdom tooth?

Wisdom Tooth: Need a definitive xray of area to diagnosis wisdom tooth problem. A careful oral examination would provide accurate diagnosis and treatment.

Symptoms: Multiple possibilities for your symptoms, so no matter what we tell you in this forum you are going to need to see a professional. Are will need to be examined and x-rayed to be diagnosed and treatment planned properly. See your Dentist for evaluation, differential diagnosis, and treatment or referral.