Hi, everyone!

About 2 months ago, I added a Giant Waxy Monkey Tree Frog to my home. Originally, he spent most of his time up on his main vine bridge and seemed quite content. However, for the last few days he has been spending a bit more time sitting on the ground floor of the terrarium and is developing light green spots on the sides of his head near the secretion glads. I remember reading that light green spots on white's tree frogs are a bad sign but I am curious if this is also the case for this species?
I am truly concerned and need to know if I need to set up a veterinarian appointment for him ASAP. Thus, any help is greatly appreciated. Thank you!