I suffer from pain in upper left side of the mandibular, what is causing this?

Please can you tell me what is that ” like a circle formation” on the RTG picture attached .
I am 55 years old female .,i feel some discomfort and pain in the upper part of the left side of the mandibular.
Can you tell me what do you see on the RTG image ?

Age: 55
Female
Medications: Metformin
General Information: I am diabetic taking metformin

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