Can you tell me about anesthesia for removing pins from under the skin?

It depends. The type of anesthesia required will depend on how much surgical work is needed to get the pins out. Thus the anesthesia requirement could range from just sedation with local/filed block by the surgeon to general anesthesia . It all depends again on what the surgical need is and I am sure your anesthesiologist in concert with your surgeon will guide you accordingly. Be well.