Umm is this normal?! Maybe TMI?

I have a hot tub and use it occasionally as a "warm tub"; I'm recently pregnant and have been in it a couple times at a safe temperature. This is my second pregnancy so of course my body is just riddled with stretch marks(fine) but when I got out of the tub after using lower back jets I noticed a burning/hot sensation from where the jets were hitting. I touched my lower back and my stretch marks had popped out?? Is this normal?! I've never had this occur before and chalking it up to those crazy hormones? 10 min out of the tub and my lower back is still inflamed