I might get a complete physical exam, including labs for vitamin levels. And, check with a dermatologist. I had dark skin appear on my stomach and arms last year. My dermatologist couldn’t decide what it was, but I was convinced it was hormonal and related to decline in estrogen. I’ve read about it.

There are some threads on this site about menopause and HRT. I would explore that for sure, if I were your age. I would do this regardless of skin situation. Many women feel they weren’t provided adequate information about menopause over the years. Information is invaluable.

I use Cerve skin care products by my dermatologist’s recommendation and they are awesome.

Please post what you find out. My dark areas have mostly faded.