pemphigoid gestationis
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Pemphigoid gestationis is a severe bullous eruption that occurs in 1 in 60,000 pregnancies.

It is unusual for a primigravid women to be affected. In affected women the skin lesions become progressively more severe during successive pregnancies.

  • self-limited autoimmune bullous disorder that presents mainly in late pregnancy or the immediate postpartum period but can appear in any of the three trimesters
  • beyond pregnancy it can also very rarely occur in association with trophoblastic tumors (choriocarcinoma, hydatidiform mole)
  • also an increased risk to develop other autoimmune diseases, in particular Grave's disease
  • pemphigoid gestationis tends to recur in subsequent pregnancies, with usually earlier onset and increasing severity. Only very rarely (5%) a pregnancy may be passed over

Pemphigoid gestationis presents with intense pruritus that occasionally may precede the manifestation of skin lesions

  • initially, erythematous urticarial papules and plaques typically develop on the abdomen
    • in this so-called pre-bullous stage, differentiation between pemphigoid gestationis and polymorphic eruption of pregnancy is almost impossible, both clinically and histopathologically
  • occurs during the second and third trimesters of pregnancy
    • initial sites include the periumbilical area, around the mouth, palms and soles
    • later lesions may become widespread
    • after about 4 weeks bullous lesions appear bullous lesions resolve about 4 weeks post-partum

Risk for fetus

  • increase in prematurity and small-for-date babies
  • neonatal pemphigus is a rare complication of pregnancy in pemphigus patients

Treatment

  • seek expert advice
  • depends on the stage and severity of the disease and aims to control pruritus and to prevent blister formation
    • in cases of mild pre-blistering pemphigoid, topical corticosteroids with or without oral antihistamines may be sufficient
    • all other cases require systemic corticosteroids
    • severe cases may benefit from immunoapheresis
    • after delivery, if necessary, other immunosuppressive treatment may be used

Reference:

  • 1) Ambros-Rudolph CM. Dermatoses of pregnancy - clues to diagnosis, fetal risk and therapy. Ann Dermatol. 2011 Aug;23(3):265-75.
  • 2) Daneshpazhooh M et al. Pemphigus and pregnancy: a 23-year experience.Indian J Dermatol Venereol Leprol. 2011 Jul-Aug;77(4):534.

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