Can using a hot water bottle on your tummy cause a blotchy rash?

I have been using a hot water bottle for about 2 weeks, every night on my stomach – just as it’s cold. I always wake up with a blotchy red stomach – obviously the water bottle is too hot but now I’ve noticed I still have a blotchy stomach even through the day. Could this be from the hot water bottle use?
It’s not itchy and when I have a shower it gets more intense but then calms down but I can still see it. It looks exactly like the hot water bottle rash – could I have irritated my skin?
Your thoughts?
I don’t think I need a Dr, I have no fever or anything, though to be fair I have just had a 24 hour gastro bug ;) x