preeruptive
adjective
                                                                                                                            
                                                            pre·erup·tive
                    
                                                                                                              
                                                                                                                                  ˌprē-i-ˈrəp-tiv 
                                                      
                                                          
            
                                
              
          
                                                      : occurring or existing prior to an eruption                                      
              
                             
the preeruptive stage of a skin disease
                         
                
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  Merriam-Webster unabridged




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