According to the force, the brawl took place last Wednesday 3 July outside a property on Windsor Road around 20:00.
A 30-year-old man, a 36-year-old woman were involved in addition to the 17-year-old boy.
No arrests were made at the time, and Police are continuing to investigate what happened.
They’re asking members of the public to help, and urging those with more information to call 612612 or make an anonymous report via the Crimestoppers website.