Based on your description, it may not necessarily be an extra (supernumerary) tooth. It could also be a partially erupting wisdom tooth (third molar) or, less commonly, an extra tooth.
If the tooth is causing pain, recurrent infection, food impaction, or is affecting the adjacent tooth, your dentist may recommend extraction. The procedure is performed under local anesthesia, so you should not feel pain during the extraction. Mild pain, swelling, and discomfort for a few days afterward are common and can be managed with prescribed medications.
Next Steps
A clinical examination along with an OPG (panoramic X-ray) is required to confirm the diagnosis. I recommend visiting an oral and maxillofacial surgeon or a dentist for an examination and X-ray. Based on the findings, they will advise whether observation or removal is the appropriate treatment.