No, there were no changes. The only thing I can connect it with is cleaning. I've gotten into some very dusty corners of my home, but actually this last time it began when I work up one morning with a tiny rash near my wrist... just woke up with it.
Could it be some kind of spider bites? You mentioned cleaned dusty corners. A few years back, I was in my daughter's closet, cleaning around and got bit all over my arms and legs by some mysterious insect. I don't know if it was an ant or spider, but it really left a lot of red bumps all over me. I was in pain for a week. Try topical anti-histamine. That should take the itchy down. Talk to your doctor. That's the next thing you should do.