[Pemphigoid gestationis after egg donation : A case report].

Pemphigoid gestationis (PG) is a blistering autoimmune skin disease, typically occurring in the second and third trimester of pregnancy. Aberrant expression of major histocompatibility complex (MHC) class II molecules on the chorionic villi seems to lead to antibody production against bullous pemphigoid (BP)-180. We report a case of PG in a woman whose pregnancy was achieved using egg donation. Since the entire fetal genome is allogeneic to the mother, augmented immune reaction in egg-donated pregnancies appears to trigger the occurrence of PG.