Maybe he could go to the doc and have fluid removed (via needle) from the lump. It may have calcified too much and the pain may last awhile, but this sounds recent so i would suggest stretching and massage. He may have sharp pain due to a nerve that may be pinched in the lump.

Anti-inflammatories, such as asprin,may help. Tylenol and other acetaminophen will probably serve no point. Aleve is Naproxen so it is the best for killing pain (OTC)

I wouldnt waste time with hot/cold packs or Aspercream (it's basically just asprin - Methyl salicylate- that your rubbing on the skin that will eventually be broken down in the liver just like taking an asprin by mouth.)