Have had this twice. First in the early 70s, and had to front the military doc each day for about 10 days where an injection of a substance that had the consistency of axle grease was made into the upper arm. Over the course of the day the enormous lump in the arm would dissipate.
Second time was in about 78. Civilian doc said "no body gets it twice" and "there is no known remedy/treatment". His advice was go to the pub for a pint.