Polymorphic eruption of pregnancy in Mexico.

Background: Currently, the exact incidence of Polymorphic Eruption of Pregnancy (PEP) in the Mexican population is unknown. PEP tends to manifest in the abdomen, primarily in the stretch marks caused by distension. It is characterized by severely pruritic urticarial-like papules that converge in plaques, extending to the buttocks and proximal thighs. Our study determined its incidence, along with other common dermatoses in pregnancy.

Methods: Patients between 14 and 45 years of age were evaluated. In each patient, a complete medical history and physical examination was performed with emphasis on skin and adnexa. Patients were followed until the end of their pregnancy.

Results: A total of 217 women were included. PEP was identified in three patients (1.38%), all primigravida, with single fetus pregnancy, and all concluded their pregnancy by vaginal delivery. The neonates were 2 females and 1 male. No other gestational pathologies were identified.

Conclusions: We identified a higher incidence of PEP than reported, without association to complications or need for medical management. There may be an association between high maternal weight and the presence of PEP, however a larger sample is needed.