Hi,Dear,Thanks for your query to HCM virtual Clinic. I studied your query in all the details put forth by you. I understood your health concerns. More information is needed like- Was the compression bandage given for that lump or not? or the injection is left without any compression bandage? Cause of painful lump in neck post-Chemical denervation- Still from the data given from you,following causes need to be ruled out- Moslty your lumps seems to be- either a venous hematoma/ or arterial hematoma , post injection,due to the accidental blind puncture of the perineural vessels in the neck. -OR a effused injection material in perineural tissue, which is causing pain due to tissue irritation from the ablative chemical use for neck nerve chemical denrvation.(Phenol or Alchohol). Still I would suggest you to take Second opinion from ER Surgeon as I don t have any first hand clinical information or a pohotograph of this lump. To confirm other causes I would hence suggest you to consult ER Surgeon or PCP doctor. But you need to be worried as it would complicate into infective and other problem associated with it. And act fast on the above suggestions,which helps you to plan treatment with your ER Surgeon. Hope this would resolve your query with full satisfaction. Welcome for any further query in this regard to ME by direct question at HCM. Write excellent review and hit thanks, to narrate your experience ,which would improve my rating for many other visitor s to HCM. Wishing you fast recovery. Have a good day. Dr.Savaskar M.N. Senior Surgical Consultant. M.S.Genl-CVTS