Hi all--
Here are some pics. Its on a HUGE NOID I've had for a while now and have never seen this before. Not all of the leaves have this-- only two or three, this one being the most obvious. There are is no apparent change in texture of quality of leaf-- its simply a discoloration.
The plant is currently in bloom and moved about two or so months ago to a brighter location because it was spiking and it needed more room to grow. Could this be too much sun? Or is it something more serious?

Underside of leaf.

Top of leaf.
Thanks for you help.