deflorescence
noun
                                                                                                                            
                                                            de·flo·res·cence
                    
                                                                                                              
                                                                                                                                  ˌdef-lə-ˈres-ᵊn(t)s; ˌdē-ˌflōr-ˈes- 
                                                                                                                                  -ˌflȯr- 
                                                      
                                                          
            
                                
              
          
                                                      : the fading or disappearance of the eruption in an exanthematous disease                                      
                
                    
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  Merriam-Webster unabridged




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