MIL has begun itching/scratching, sometimes until she bleeds. Is this a common problem in dementia?

There are some anti-itch lotions that can help, although they are a little expensive. CeraVe lotion for itch relief helped my mother.

If she was taking opioids, those on their own can cause severe itching. With dementia, there is no rhyme or reason for why a person does anything. You are always just trying to stay one step ahead--frustrating, I know.

I'd go along with a change of anxiety meds. Often those will be enough to deal with a problem that seems to have no underlying cause. Anxiety at any stage of life is awful!

Have you pursued having the anxiety meds revisited and possible changed or adjusted?