When I was exactly your age, about 5 years ago, I had a rash on my tummy and I went to see 2 allergists and 1 dermatologist about it. They all agreed that I needed to be on anti-itch meds plus anti-histamines for life. They said that people get rashes, no one knows why but they often disappear just as they came...and to take the meds. I was SO drowsy on the meds but could not get off them without the hives (which were itchy). I went to see my local holistic health practitioner who said to get off all carbs. Within 2 days I was off the meds and the hives did not return...until I tried to re-introduce the carbs again. I don't know if your rash would be the same. A rash can be the result of more serious disease such as lymphoma so I would get it checked out in order to rule it out. But get off the carbs in the meantime to see if the rash disappears. Good luck. BlueEgg
A rash is extremely unlikely to be associated with either fibroids or perimenopause. It is always difficult to guess what a rash might be due to without seeing it and more information but almost certainly not due to the causes you asked about.
Machelle M. Seibel, MD