Im sorry, i thought you put the pic up because her fat pads were sunken.
do you knkw how old she is?
It could be just a fat deposit, but it could also be something more serious. Someone elses beardie had this and it ended up being cancer. A vet opinion wouldnt hurt, but i would pm one of the moderators on this site. She is very experienced and knows beardies well. She will be able to tell you if she needs to be seen by a vet and all the possibilities it could be. Im not sure, as ive never had experience with something like this.
Drache613 is her username, and her name is Tracie, shes amazing. Just send her a message with the pictures and she will tell you exactly what you can do. She has helped me so much, and many many others on this site. I call her heaven sent.