That mark is just a piece of repti-bark that I must of missed. I just had misted the tank prior to taking pics. My normal that I do have that I know I have is much much darker. When I was looking at the genetic wizard I came across a disco that looked much like this. http://www.worldofballpythons.com/morphs/disco/ My phone does not take the greatest of picture, but color wise it's as light as the link