I got it from an old Dark Horse Comics "Tales of Boba Fett" in which Boba and Dengar are teamed up to find someone and Dengar sees him out of his armor and asks how he got these scars all over his body. Boba says that while he did get out of the Sarlacc alive, he was in the beginning stages of digestion meaning that gastric acids started to burn away his flesh. Yummy, eh?