You see Jane who is 35 weeks pregnant with her first child. It has been an uncomplicated pregnancy so far and she is under midwife-led care. Her midwife asked her to see her GP because over the last week she has developed a very itchy rash on her abdomen.
On examination there are urticated papules and plaques in the stretch marks around her umbilicus, with sparing of the umbilicus. There is no rash elsewhere, she is apyrexial and urine dipstick is normal. Jane tells you she suffered with bad Eczema as a child but other than this has no known skin conditions.
What is the most likely diagnosis?