Here are a couple pictures. In the first one, you can kind of see the affected region (those horizontal white/grey stripes). The second picture is a closer view of the more damaged skin.

Another factor might be humidity. I'm doing my best to keep it around 70% but I'm still getting my setup in order and there have been week stretches where the humidity's been closer to 50% or even 40%. It's bad I know, but I'm working on it.