Pruritic urticarial papules and plaques of pregnancy (PUPPP), known in United Kingdom as polymorphic eruption of pregnancy (PEP), is a chronic hives-like rash that strikes some women during pregnancy. Some skin changes are known to occur in people who are pregnant while other skin conditions, or dermatoses, that people have prior to getting pregnant will become altered or symptoms will increase. Pruritic urticarial papules and plaques of pregnancy (PUPPP) is one of many skin conditions that is specific to pregnancy and occurs in about 1 in every 160 (0.625%) of pregnancies.

It presents no long-term risk for either the woman or fetus as there is no statistical increase of risk of premature labor or fetal loss, despite frequently severe pruritus.

PUPPP usually first appears on the abdomen and often spreads to the legs, feet, arms, chest, and neck. The face is usually not affected. Skin distension (stretching) is thought to be a possible trigger for PUPPP as it most commonly affects primigravida (women in their first pregnancy), those with large fundal measurements (distance from the pubic bone to the top of the uterus) and/or those who are carrying large babies or multiples. The papules and plaques often first appear within stretch marks before changing appearance and spreading to other areas of the body.

It is important that those who are pregnant heavily consider the recommendations of their full healthcare team. For those who may be experiencing signs and symptoms of PUPPP, it is strongly recommended they speak with their primary care physician and receive a consult from a dermatologist regarding skin changes during pregnancy.