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Polymorphic eruption of pregnancy is also known as PUPPP (Pruritic Urticarial Papules and Plaques of Pregnancy). This usually starts on the abdomen, spares the umbilicus, and may spread to the thighs or buttocks. Symptomatic treatment includes emollients, topical corticosteroids, and antihistamines.
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Polymorphic eruption of pregnancy
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Atopic eruption of pregnancy presents similarly to eczema and is most common in women with a history of eczema. Typical sites include the face, neck, chest and flexor surfaces of the upper limbs. Treatment is with emollients and topical corticosteroids.
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Atopic eruption of pregnancy
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Pemphigoid gestationis is rare, and causes itchy rash which typically forms around the umbilicus and progresses to form blisters. The condition is likely to flare up again throughout the pregnancy. Management is with emollients and topical corticosteroids.
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Pemphigoid gestationis
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Contact dermatitis is a type of eczema occurring following exposure to a causative agent. It presents with a dry, painful and pruritic skin rash where the skin has been in contact with a certain irritant.
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Contact dermatitis
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Obstetric cholestasis is caused by elevated bile acids, and does not cause a rash in itself but does cause intense pruritus, which can then develop into a rash. Cholestasis is treated with ursodeoxycholic acid, with emollients and antihistamines being useful for the itchy rash.
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Obstetric cholestasis
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Why is this not pemphoid gestationitis? 
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it could be, but its much more rare
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Metabolism Myotonia
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It says fluid-filled vesicles- isn't that more likely to be blisters than papules or plaques?
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Acute Body
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vesicles is definitely pointing towards pemphigoid >>> Polymorphic eruption has papule and plaques?? 
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# Overview

Rash is common in pregnancy and can occur due to any of the reasons a rash may occur in a non-pregnant individual. However there are conditions specifically related to pregnancy.

# Polymorphic eruption of pregnancy (PEP) features

PEP occurs most frequently in the third trimester and presents with itchy papules, typically first appearing on striae gravidarum, but may spread to the entire abdomen, thighs and buttocks. It may progress to a widespread eczematous rash with fluid-filled vesicles. PEP can be treated with emollients and and topical corticosteroids.

# Obstetric Cholestasis

Obstetric cholestasis is caused by elevated bile acids, and does not cause a rash in itself but does cause intense pruritus which can then develop into a rash. Cholestasis is treated with Ursodeoxycholic Acid, with emollients and antihistamines being useful for the itchy rash.

# Atopic eruption of pregnancy

Presents similarly to eczema and is most common in women with a history of eczema. Typical sites include the face, neck, chest and flexor surfaces of the upper limbs. Treatment is with emollients and topical corticosteroids.

# Pemphigoid gestationis

A rare, itchy rash which typically forms around the umbilicus and progresses to form blisters, thought to be auto-immune in aetiology. Management is with emollients and topical corticosteroids. The condition is likely to flare up again throughout the pregnancy.

# External links

[- Royal College of Obstetricians and Gynaecologist: Obstetric Cholestasis](https://www.rcog.org.uk/en/guidelines-research-services/guidelines/gtg43/)
[- British Association of Dermatologists: Polymorphic Eruption of Pregnancy](https://www.bad.org.uk/shared/get-file.ashx?id=227&itemtype=document)
[- British Association of Dermatologists: Pemphigoid Gestationis](https://www.bad.org.uk/shared/get-file.ashx?id=224&itemtype=document)
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Rash in pregnancy
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Obstetrics
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Rash in pregnancy
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Quesmed Tutorial: Obstetrics 2
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A 24-year-old woman attends her general practitioner worried about a rash. She is 35 weeks pregnant, and has noticed an itchy rash on her abdomen and thighs in the last few days. She says is started on her stomach, and initially wasn't itchy, however it has become itchy over the last day.

On examination, she has a widespread eczematous rash consisting of papules and plaques over her abdomen, thighs and buttocks. There is umbilical sparing. There is evidence of excoriation across her abdomen.
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