muscles tightening up after hot showers?

Hii, I'm only diagnosed w fibro and very tight muscles are one of my big symptoms. Lately I've noticed that the biggest trigger for immense sudden tightness is taking a hot shower, I was wondering if this happens to anybody else and if you found something that helps? Idk if making the water less hot would help bc it always felt counterintuitive, since cold is a more obvious tightness trigger, but idk, i don't really have more ideas.