ok, I was able to view the pics by saving them and using a photo editor to magnify the pics....

the tail looks as if it is an injury due to shed skin not coming off- the end part from the cloaca on is effected... and the belly looks like scale rot or a burn....

to those reading this..the belly has purplish or red track mark looking markings, it is definately an injury of some sort...

GET YOUR SNAKE TO A VET IMMEDIATELY! As there is not much we can do to help you on that.

Furthermore, please evaluate your husbandry practises and try to figure out what you can do to prevent from happening again should your snake come out OK after this. If it is a burn, you need to fix the problem so it dont occur again... if it has belly rot, you may need to ask yourself how clean your snakes home really is because most scale rot is caused by a dirty environment.

How long have you had this snake? Can you tell us about your cage, heat, feeding, substrate and cleaning practices, so we may help you fix this problem so it does not reoccur later?