Are you sure the scales are actually falling off? What you describe sounds really weird. However, sometimes they will develop small patches of discolored scales that look kind of grayish/bland....no color to them. That is a normal phenomena akin to patches of dry skin that we sometimes get. It's harmless and will shed out, but you may see a different patch pop up after a shed. It might be an indicator that you need to focus on humidity a little more.
You could, indeed, set up a humidifier in the room...just monitor it closely to make sure you're not getting TOO much moisture in the cages.
Another option is moistened sphagnum moss placed in the hides.
And when I had a brief period of extremely dry conditions, I wet a wad of paper towels (wrung them out just enough so they weren't dripping) and placed them in the enclosure. Be sure to change daily, although they will probably dry out before bacteria gets a chance to germinate.
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