It could be scale rot, it is under the scale right. If so you will have to get it checked.
Just a while ago there was a good string on this
I can't recal on what topic forum though.
Simply incredible carpet pythons
Coastal- Hypo Jaguar, Tri-stripe Jaguar, Silver
West Papuan/Irian Jaya
Jungle, Jungle x Diamond, Bredli
50% WP Jaguar crosses