The Bottom Line

Pemphigoid gestationis (PG) is a rare autoimmune blistering disease that occurs during pregnancy or shortly after delivery. It causes intensely itchy hives and blisters, typically starting around the belly button and spreading outward. While distressing, PG is treatable with topical and sometimes oral corticosteroids, and it usually resolves within weeks to months after delivery. The condition can affect the baby mildly in about 5-10% of cases but is not life-threatening to mother or child with proper management.

What Is Pemphigoid Gestationis?

Pemphigoid gestationis (formerly called herpes gestationis, despite having nothing to do with the herpes virus) is a rare autoimmune skin disorder that occurs exclusively during pregnancy or the immediate postpartum period. It affects approximately 1 in 20,000-50,000 pregnancies. The immune system produces antibodies (IgG) that attack a protein (BP180/collagen XVII) in the basement membrane zone — the layer connecting the epidermis to the dermis — causing the skin layers to separate and form blisters.

PG typically begins in the second or third trimester (though it can appear at any point during pregnancy or within days of delivery). It often starts as extremely itchy urticarial plaques (hive-like raised patches) around the umbilicus (belly button) that spread to the abdomen, thighs, and sometimes the arms and legs. Over days to weeks, tense blisters develop within these inflamed areas.

Signs and Symptoms of Pemphigoid Gestationis

Early stage: Intense itching (often the first and most prominent symptom), red urticarial papules and plaques (hive-like bumps) starting around the belly button and spreading centrifugally across the abdomen, and a burning or stinging sensation.

Blistering stage: Tense, fluid-filled blisters (vesicles and bullae) develop within the urticarial plaques. Blisters range from small (a few millimeters) to large (several centimeters). The blisters are tense (firm, not easily ruptured) — a hallmark that distinguishes PG from other pregnancy rashes.

Distribution: Begins periumbilically (around the navel) in 90% of cases, spreads to the abdomen, thighs, and extremities. Typically spares the face, mucous membranes, palms, and soles (unlike some other blistering diseases).

Course: Often flares at delivery or immediately postpartum. Usually resolves spontaneously weeks to months after delivery. Can recur in subsequent pregnancies (often earlier and more severely) and with oral contraceptive use.

What Causes Pemphigoid Gestationis?

PG is an autoimmune condition triggered by the unique immunological changes of pregnancy. The placenta expresses paternal (foreign) MHC class II antigens that the mother's immune system recognizes. In susceptible women, this triggers production of IgG autoantibodies against BP180 (collagen XVII), a protein in the dermal-epidermal junction. These antibodies activate complement (an immune cascade) at the basement membrane, causing inflammation and separation of the skin layers — producing the characteristic blisters.

Risk factors include first pregnancy (though it can occur in any pregnancy), a personal or family history of autoimmune conditions, and certain HLA types (HLA-DR3 and HLA-DR4 are strongly associated).

Treatment Options for Pemphigoid Gestationis

Mild PG (urticarial plaques, minimal blistering):

  • Potent topical corticosteroids: Clobetasol propionate 0.05% or betamethasone dipropionate applied to affected areas twice daily — first-line treatment for mild to moderate disease
  • Oral antihistamines: Cetirizine or loratadine for itch relief (pregnancy-safe second-generation antihistamines)
  • Emollients: Frequent moisturization to soothe irritated skin

Moderate to severe PG (widespread blistering):

  • Oral prednisolone: 0.5-1 mg/kg/day, tapered gradually once disease is controlled. The mainstay treatment for significant disease. Generally safe in pregnancy at moderate doses with OB monitoring.
  • Intravenous immunoglobulin (IVIG): For severe cases refractory to corticosteroids
  • Postpartum options: Once delivered, dapsone, rituximab, or other immunosuppressants can be considered for persistent disease

Monitoring during pregnancy: PG is associated with a small increase in preterm delivery and small-for-gestational-age babies. Your obstetrician should monitor fetal growth with serial ultrasounds. About 5-10% of newborns develop mild, self-limiting blistering from transplacental antibody transfer — this resolves on its own within weeks as maternal antibodies clear.

When to See a Dermatologist

See a dermatologist urgently if you develop intensely itchy hives or blisters during pregnancy — especially if they start around the belly button and spread. PG must be distinguished from other pregnancy rashes (PUPPP, intrahepatic cholestasis) because management differs significantly. Diagnosis is confirmed through skin biopsy showing linear C3 and IgG deposits at the basement membrane on direct immunofluorescence. Early diagnosis and treatment reduce symptom severity and duration.

Frequently Asked Questions

Is pemphigoid gestationis dangerous for my baby?

PG is generally not dangerous but does warrant monitoring. The main fetal risks are mild: slightly increased rates of preterm delivery and small birth weight. About 5-10% of newborns develop temporary, mild skin blistering from maternal antibodies crossing the placenta — this resolves spontaneously within 2-4 weeks as the antibodies are cleared. Stillbirth is extremely rare and not clearly linked to PG when properly managed.

Will PG come back in my next pregnancy?

PG recurs in approximately 50-75% of subsequent pregnancies, often presenting earlier (first or second trimester) and sometimes more severely. It can also be triggered by oral contraceptive pills. Some women with PG choose to avoid estrogen-containing contraceptives. Discuss these risks with your dermatologist and obstetrician when planning future pregnancies.

How is PG different from PUPPP (the common pregnancy rash)?

PUPPP (pruritic urticarial papules and plaques of pregnancy) is the most common pregnancy-specific rash and can look similar to early PG. Key differences: PUPPP typically starts in stretch marks on the abdomen (not around the belly button), PUPPP does NOT form true blisters, PUPPP usually occurs in first pregnancies only and doesn't recur, and PUPPP is not autoimmune and doesn't affect the baby. If blisters develop, PG should be suspected and biopsy performed.

How long after delivery does PG last?

Most cases resolve within weeks to months after delivery, though a postpartum flare is common (often at delivery or within 24-48 hours). Some women clear within 2-4 weeks postpartum; others take 3-6 months. Rarely, PG persists for over a year. Breastfeeding does not typically worsen PG, and most treatments used for PG are compatible with breastfeeding.

References

  1. Ambros-Rudolph CM, Müllegger RR, Vaughan-Jones SA, et al. The specific dermatoses of pregnancy revisited and reclassified. J Am Acad Dermatol. 2006;54(3):395-404.
  2. Jenkins RE, Hern S, Black MM. Clinical features and management of 87 patients with pemphigoid gestationis. Clin Exp Dermatol. 1999;24(4):255-259.
  3. Shornick JK. Pemphigoid gestationis. Semin Dermatol. 1989;8(1):55-60.
  4. Chi CC, Wang SH, Charles-Holmes R, et al. Pemphigoid gestationis: early onset and blister formation are associated with adverse pregnancy outcomes. Br J Dermatol. 2009;160(6):1222-1228.

Trusted Resources

  • American Academy of Dermatology Association. "Pregnancy Skin Conditions." aad.org
  • National Organization for Rare Disorders (NORD). "Pemphigoid Gestationis." rarediseases.org
  • DermNet NZ. "Pemphigoid Gestationis." dermnetnz.org

If you develop itchy blisters during pregnancy, see a dermatologist promptly — early diagnosis and treatment of pemphigoid gestationis leads to the best outcomes for you and your baby.