Source : Webster's Revised Unabridged Dictionary (1913)

Recrudescence \Re`cru*des"cence\ (r?`kr?*d?s"sens),
Recrudescency \Re`cru*des`cen*cy\ (-d?s"sen*s?), n. [Cf. F.
   recrudescence.]
   1. The state or condition of being recrudescent.

            A recrudescence of barbarism may condemn it [land]
            to chronic poverty and waste.         --Duke of
                                                  Argyll.

   2. (Med.) Increased severity of a disease after temporary
      remission. --Dunglison.

Source : WordNet®

recrudescence
     n : a return of something after a period of abatement; "a
         recrudescence of racism"; "a recrudescence of the
         symptoms"