Final answer:
The underlying condition in this case is Sialolithiasis, which causes recurrent jaw pain and a tender mass under the jaw. Oral antibiotics can help resolve the symptoms, but further evaluation may be necessary for recurrent episodes.
Step-by-step explanation:
The underlying condition in this case is Sialolithiasis, also known as salivary gland stone. This condition occurs when there is a blockage or stone formation in the salivary gland or its ducts. The symptoms of recurrent episodes of jaw pain, pain worsened by eating, a tender mass under the left jaw, and fever are consistent with this condition.
Sialolithiasis commonly affects the submandibular gland, which is located under the jaw. The blockage of the gland or its ducts can lead to the formation of a tender mass and cause episodes of pain, especially when eating. Oral antibiotics can help resolve the symptoms, but recurrent episodes may require further evaluation and treatment.
Learn more about Sialolithiasis