Hi,Welcome.Based on the facts of your query- You seem to suffer post-pertusis shot Lymphnode adenitis, with reactive hyperplasia.and is a known body reaction.Nothing to worry.Show it to your doctor only if it persists with symptoms after 1 mth. Hope this would help you to plan further treatment with your doctor. Will appreciate your Hitting thanks and writing excellent review comments to help needy patients like you. Welcome with any other further query in this regard. Good Day!! Dr.Savaskar, Senior Surgical Specialist M.S.Genl-CVTS