<prompt> Nikoiskys sign is positive inPemphigusDermatitis herpatiformisPemphigoidRubella  <response>: Nikolskys sign : Development of an erosion on surrounding normal skin following shearing pressure .Though this sign is characteristic for pemphigus group of disorders is not specific and can be elicited in burns and other skin disorders. Page no. 281 Reference IADVLs concise textbook of dermatology 