A neuropraxia (temporary injury to a peripheral nerve) will not show up as swelling although a neuropraxia can be associated with an injury and swelling. You are noting a “Tinels sign” when you percuss the injured nerve area. This is normal (see “nerve entrapment” on the website).
Donald Corenman, MD, DC is a highly-regarded spine surgeon, considered an expert in the area of neck and back pain. Trained as both a Medical Doctor and Doctor of Chiropractic, Dr. Corenman earned academic appointments as Clinical Assistant Professor and Assistant Professor of Orthopaedic Surgery at the University of Colorado Health Sciences Center, and his research on spine surgery and rehabilitation has resulted in the publication of multiple peer-reviewed articles and two books.