The etiology with a view periodical patterns is nonspecific, although, when iden- tified bilaterally, they usually display an severe or subacute, circuitous, encephalopathic process. Histopathologic Features Intraepidermal vesicle/bullae with imperfect to unmitigated necrosis of the blister roof Reticular degeneration of keratinocytes Scarcity of…[Read more]