Help! Warning-- stretch marks

Hannah 👶💙
I'm 33.2 weeks. For the past 2 weeks I have had this horrible itching on my stretch marks. They are bright red because they are inflammed. My doc says it's polymorphic eruption. Happens with first time mom's and mom's with multiples. I have tried everything to take the itch away- cortisone, aquaphor, coconut oil, bio-oil, and Burts bees mama bee. A cold compress helps but I can't really do that all day. Also everything I have read says it can last until delivery. If anyone has any suggestions I am open to anything!. Help!