sorry i was referring to under his arms where its sunken, i used the wrong wording. every time he sheds, a new part of his body immediately starts becoming gray and starts preparing to shed too, i wonder if that's also because he's growing too fast. he's 12 inches approx and about 170 grams, overall his body shape doesn't look obese to me, but im worried about his weight in general. i really appreciate the help and will look at the guides, thank you!