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Introduction. During pregnancy, at least 20% of the expectant mothers are affected by several forms of dermatosis, which involve a heterogeneous group of skin conditions with a variety of manifestations and evolution. The objective is to present a case of initial polymorphic eruption during the postpartum period with a brief review of the literature related to the pathology and its treatment. Case report. We present the case of a 38 year-old postpartum patient in her frst pregnancy, who exhibited a clinical case of skin eruption and pruritus that started in the abdominal area and extended to the lower limbs. The lesions consisted of erythematous papules that clustered together to form plaques. She was diagnosed with polymorphic eruption of pregnancy and was treated with antihistamines, which resolved the pathology. Discussion. Polymorphic eruption of pregnancy is a benign infammatory disorder of the skin It starts with the appearance of pruritic papules that cluster together to form erythematous plaques that initially appear in the abdomen (with the exception of the umbilical area) and generally start at the stretch marks and disseminate to the extremities. Treatment consists of the use of emollients and antihistamines to control the lesions and the pruritus. Conclusions. Although this is a benign, self-limiting condition, it is important to reach a correct diagnosis and initiate adequate medical treatment, as symptoms like pruritus can generate lesions from scratching that usually become infected and compromise the patients’ health. [ABSTRACT FROM AUTHOR]