The Collaborative International Dictionary of English v.0.48:

Recrudescent \Re`cru*des"cent\ (-sent), a. [L. recrudescens,
   -entis, p. pr. of recrudescere to become raw again; pref. re-
   re- + crudescere to become hard or raw: cf. F. recrudescent.]
   1. Growing raw, sore, or painful again.
      [1913 Webster]

   2. Breaking out again after temporary abatement or
      supression; as, a recrudescent epidemic.
      [1913 Webster]

WordNet (r) 3.0 (2006):

recrudescent
    adj 1: the revival of an unfortunate situation after a period of
           abatement; "the patient presented with a case of
           recrudescent gastralgia"