PUPPP (Pruritic Urticarial Papules and Plaques of Pregnancy)
PUPPP (Pruritic Urticarial Papules and Plaques of Pregnancy) occurs "...late in the first pregnancy, a woman gets an itchy pimply skin eruption presenting with edema and redness on her abdomen and in her stretch marks. These lesions can also enlarge to include the thighs, buttocks and upper arms. No laboratory test abnormalities are noted. They are not harmful and will disappear postpartum. The newborn may also have these lesions, but they are presumably benign." Frye, Holistic Midwifery I
Here is what I have read helps:
Eating a nutrient-dense diet - see Eat for Health by Joel Fuhrman
Eliminate ALL artificial ingredients, if it has a label and lists a non food, do not eat it.
Castor oil on the skin at night.
Oatmeal baths, Avena has an oatmeal bath that is less messy than making your own.
Support your liver with beets, raw or cooked.
Dandelion root
Yellow dock.
Drink half your weight in ounces of water. And add fresh squeezed lemon juice to it.
More green vegetables!
Avoid stress on your body, emotionally, physically from the diet or environment.
Avoid meat which is ful of hormones and additives.
No saturated fats.
Seems to indicate PUPPP is likely only in a first pregnancy, though surely there are exceptions. For comparison's sake, here's info on several other possibilities, all from Holistic Midwifery:
Use plain yogurt as a lotion to help stop itching, or even as a bath (!)... she suggests homemade yogurt for such a large-scale operation. ;) You put anywhere from a quart to a gallon of yogurt in the tub and then fill it with water. Or you can just use cornstarch, 1 cup or more to a tub of water, or oatmeal (Aveeno bath, or just plain rolled oats in a piece of cloth tied to the faucet as you fill the tub)."
Avoid the regular prescription-type vitamins and iron, which have tons of dyes, synthetic vitamins, and constipation-causing, hard-to-assimilate iron. A natural prenatal vitamin from a health food store is better, and any iron supplement that is causing constipation "should be discontinued immediately."
Test the urinary Chorionic Gonadotropin, just to rule out papular dermatitis, which though rare, can be serious.