Help? Burning sensation?

Cherokee

Hi! So I'm 31 weeks pregnant and right under my boob on the top of my belly there is a SERIOUS burning sensation that WILL NOT go away. I've tried ice, I've tried aloe, I've tried Benadryl cream, I've tried so much! There aren't any marks, no new changes to shampoos, washes, lotions and etc. just randomly occurs and stays for a bit. My skin doesn't get red or inflamed. It just feels like a really really sensitive and bad sunburn but it's only in a very tiny spot on my belly. Why? What could be causing it? Any advice to get rid of it?