Hi XXXXXXX,\r\rThanks for writing to health care magic.\r\rPain at the site of injection and lump at the site of injection are known side effects of Tdap vaccine. The lump may take few weeks to disappear. So I reassure you to not to worry regarding the same.\r\rWe normally prescribe Paracetamol for relief of pain in such scenario. Application of ice at vaccination site may help in such scenario.\r\rHope this helps. Let me know if you have other concerns\r\rTake care\r\rDr Y V Siva Sankara Murty\rM.D.(Pediatrics)\rAssociate Professor of Pediatrics\r\rPS: If you liked my answer and wish to communicate with me in future, you can ask me on this link:\r WWW.WWWW.WW