recrudescence
noun
[ ˌriːkruːˈdɛsəns ]
• the recurrence of an undesirable condition.
• "recrudescence of the disease is a real possibility"
Origin:
mid 17th century: from Latin recrudescentia, from recrudescent- ‘becoming raw again’, from the verb recrudere, from re- ‘again’ + crudus ‘raw’.
