Hot, heated skin

My skin has been getting super hot, especially my thighs, low back and chest since for about 3 weeks now. I'm about 6 1/2 weeks. Nothing seems to help. Thought it was just dry skin but I use lotion a couple times everyday and I'm not hot internally, just my skin. It mostly happens at night and it's so uncomfortable that I can barely sleep.  Don't remember having this with my first. Just wondering if anyone else has experienced this, and how long did it last?