The commonest pregnancy specific dermatosis. Incidence is about 1 in 200-250 ie about 0.5%.
Occured in 3rd trimester, usually after 35 week's gestation.
More common in primiparous and multiple pregnancies.
Distributed over the abdomen along the striae (with umbilical sparing), with spread to thigh, buttock, under the breast and upper arms.
Pruritic, urticarial, plaques, rarely vesicles and target lesions
Histology shows epidermal/dermal oedema, perivascular infiltration, and patchy parakeratosis.
Resolve usually 2 weeks after delivery.
No effect on fetus.
Treatments include 1% menthol in acqueos cream, 1% hydrocortisone cream or oinment, sedative antihistamine. Systemic steroids are only occationally required for intractable cases.
Recurrence is uncommon.
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