Herpes gestatioinalis is: (A) Caused by Herpes virus, (B) Autoimmune reaction to collagen XVII in  basement membrane of skin, (C) Neutrophilic degranulation at dermal - epidermal junction, (D) Less severe in subsequent pregnancies.
Answer is B. Herpes gestationalis (pemphigoid gestationis ) is characterized by eosinophilic degranulation at dermal-epidermal junction. Becomes severe with subsequent pregnancies.