hello, I got a tdap 2 days ago and yesturday I woke up with a knot just above my collar bone, I am assuming it is a lumph node, of course my arm hurt really bad(still) and the knot is still there, doesnt seem as painful today, about the size of a quarter maybe.  is this a normal reaction?
HI, Welcome to Chat Doctor. Based on the facts of your query, you seem to suffer from-Reactive lymphadenitis above the collar bone after the trap, as cellular Pertussis vaccine is known to cause lymph node swellings after the shot. This is due to the immune reaction in the regional nodes or nearby nodes in neck and maxilla and is known to occur after trap shots. Welcome for any further query in this regard Will appreciate writing your feedback review comments, to help the needy patients like you at Chat Doctor. Good Day!! Chat Doctor. S. Genl-CVTS