1.Ballooning mostly

1)Lymphocyte predominate
     a)Steel-gray nuclei and margination of chromatin
                  Herpes virus infection

      b)Individual necrotic keratinocytes and rnultinucleate 
          epithelial giant cells
                    Measles

2.Interface
1)Lymphocyte predominate
      a)Individual necrotic keratinocytes, normal cornified layer
                     Erythema multiforme
       b)Individual necrotic keratinocytes, prorTiinent 
         granular layer, parakeratosis
                     Graft vs. host reaction

2)Eosinophiles and Neutrophiles prominent
       a)Individual necrotic keratinocytes, ballooning, normal 
          cornified layer
                      Fixed drug eruption, superficial

         b)Individual necrotic keratinocytes, spongiosis, neutrophils 
          as solitary units within epidermis
                       Toxic shock syndrome

3.Psoriasiform
1)Lymphocyte predominate
      a)Intracytoplasmic  inclusion bodies
                     Orf
                     Milker's nodule