Pins are often used to stabilize fractures as well as clean breaks. Given the time frame we are discussing chances are it was a fracture. Pins allow for the fracture to heal faster than a cast alone.
In the end I think this will be no big deal.
Gupta R, Raheja A, Modi U. "Colles' fracture: management by percutaneous crossed-pin fixation versus plaster of Paris cast immobilization." Orthopedics. 1999 Jul;22(7):680-2.
Colles' fracture is the most common fracture seen in orthopedic practice. This prospective, randomized study of 50 patients evaluates the efficacy of maintaining reduction and consequent functional end results of two treatment methods, ie, percutaneous crossed-pin fixation followed by plaster of Paris cast immobilization with the wrist in functional position versus conventional plaster of Paris cast immobilization. The anatomical and functional end results were significantly better with percutaneous crossed-pin fixation.