Hello and welcome to HCM,
The black colored shadow on the X-ray appears to be a cyst.
A cyst can be benign or part of any neoplasm.
However, do not panic.
The location of the cyst and its close proximity with the wisdom tooth is suggestive of a benign cyst.
Surgical removal of the cyst is the treatment of choice.
Consult your dental surgeon for clinical assessment and thus management.
Histopathological examination of the cyst is required to know the exact character of the cystic structure.

Thanks and take care
Dr Shailja P Wahal

Heloo pt-
Dental cysts can become infected, which can create pain and swelling in the mouth. They may also push up against nearby teeth, which can cause the teeth to shift slightly or become sensitive. Cysts can also cause your jaw to weaken as they can take over where bony tissue has died.
The best way to prevent a cyst from forming is to visit your dentist.and This will allow your dentist to keep an eye on your mouth and observe any abnormalities or changes in your teeth. Root canals can prevent dental cysts from forming by filling in the space around a dead nerve after it has been removed. This is an effective preventative measure because dental cysts often form near or on top of dead nerves, which typically occur from decay, infection to the mouth.