I get urticaria in pregnancy. It isnt PUPPS, it's just extremely irritating.

Things that worked for me:
* cool/lukewarm showers
*spraying my skin with Dr Wheatgrass spray
* Wiping down with diluted apple cider vinegar (though the wheatgrass was better)
*moisturising with coconut oil
*trying not to scratch
*wearing natural fibres (though not scratchy wool clothes)

My liver function tests were all good.