tlh97990: I've heard of that. It might be Pruritic urticarial papules and plaques of pregnancy (PUPPP)
Up to 1 percent of pregnant women develop a condition characterized by itchy, red bumps and larger patches of a hive-like rash on their bellies. This is called pruritic urticarial papules and plaques of pregnancy (PUPPP), also called polymorphic eruption of pregnancy.
PUPPP usually begins in the third trimester, though it can begin earlier or, occasionally, during the first two weeks after you give birth. It's more common in women carrying twins and those having their first baby. No one knows what causes PUPPP.
The eruptions, which can itch like crazy, usually show up first on the abdomen around or in stretch marks (if you have any). It may spread to your thighs, buttocks, back, and, more rarely, your arms and legs. Your neck, face, hands, and feet are usually spared.
Your doctor or midwife will probably prescribe a topical ointment to give you some relief. She may also recommend an antihistamine. In severe cases, you may need a course of oral steroids.
The good news is that PUPPP is not risky for you or your baby and usually disappears within a few days after delivery, although it sometimes persists for several weeks. Plus, it seldom appears again in subsequent pregnancies.