Pemphigoid gestationis

By trimester

Weeks 1–13

1st trimester

Pemphigoid gestationis is unusual this early, but early onset has been associated with less favorable pregnancy outcomes in a small retrospective cohort. A blistering or rapidly spreading itchy rash needs prompt dermatology and obstetric assessment rather than an assumption that it is PUPPP.

Weeks 14–27

2nd trimester

Pemphigoid gestationis commonly begins in the second or third trimester. Itchy plaques around the navel that progress to tense blisters are a key pattern, but skin biopsy with direct immunofluorescence helps distinguish it from other pregnancy rashes.

Weeks 28–birth

3rd trimester

The rash can intensify near delivery and may flare after birth. Obstetric follow-up may include fetal growth assessment based on onset, blistering, and other clinical factors, while dermatology guides symptom control and monitors skin involvement.

What does the evidence show for pemphigoid gestationis?

• Pemphigoid gestationis is an autoimmune blistering disorder that usually begins in the second or third trimester with severe itching and urticarial plaques, often around the navel, followed by tense blisters. Direct immunofluorescence typically shows linear C3 deposition along the basement membrane. 1
• Pemphigoid gestationis results from antibodies directed at placental and skin proteins, especially collagen XVII. An older review notes that the condition often settles within weeks to months after delivery and commonly recurs in later pregnancies, while available care evidence was largely based on case reports and clinical experience. 2
• A retrospective cohort of 61 affected pregnancies found that earlier onset and blister formation were associated with lower gestational age at birth and lower birthweight. The study had no disease-free comparison group, drew cases from specialist databases, and produced wide confidence intervals for low-birthweight estimates. 3
• A 2026 US hospital-discharge study identified 371 coded pemphigoid gestationis cases among more than 4.3 million delivery records and reported associations with several maternal and obstetric outcomes. It found no statistically significant newborn adverse events, but coding data lacked onset, severity, outpatient cases, and clinical confirmation. 4
• In a multicenter retrospective cohort of 95 patients, higher anti-BP180 antibody values were associated with fetal growth restriction after adjustment, but the proposed threshold had modest specificity and low positive predictive value with wide confidence intervals. The result may aid specialist risk assessment but is not a stand-alone outcome forecast. 5

When should I call my provider about pemphigoid gestationis?

Seek prompt dermatology and obstetric assessment for a rapidly spreading intensely itchy rash, involvement around the navel, or any tense blisters because pemphigoid gestationis can resemble other pregnancy eruptions early. Fever, facial or mouth involvement, eye symptoms, skin pain, pus or spreading redness, extensive peeling, trouble breathing, or facial swelling requires urgent or emergency care. Trust your read on your own body. If something feels off beyond the list above, please consult your healthcare provider rather than waiting it out.