I have a purple capricornis that has done this....it had a small white spot in the center, and then it just colored back up.....Just recently a piece of salt creep landed on an edge of it, and it has whitened again....and it is also coloring back up
SOOOO...I did nothing, and all turned out okay
![Smile :) :)](data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7)