In Kings II 5:1 we are told that Naaman the general of Aram was afflicted with tzaraas. I have seen several explanations which outline something he did wrong, the punishment for which was tzaraas. However, from what I understand tzaraas is a spiritual affliction, which seems to have very little to do with non-Jews (see Negaim chapters 3, 11, and 12 the first mishna in each). In every answer I have seen we could replace tzaraas with any other disease and the 'effect' (ie the spiritual tit-for-tat punishment to Naaman) would have been the same.
I would like to know if there is a reason that Naaman was punished with this disease specifically.