There's no set timing, and that is 100% shed. I've seen it on my own beardies before....if I can find pics of mine I'll post them, but there's no doubt that's what it is.
And I know you didn't mean to type rio optic ....what was that supposed to be ?
Here's a pic of one of mine from a while back, her sides weren't in shed but they do like that just like the rest of their body....heads, legs, tails, back can all go randomly in to shed like that. https://www.beardeddragon.org/media/29897/full
hahah omg that was supposed to be antibiotic lmao, ok thank you !~! i will worry much less now, we've only had her about a month and the previous owner wasn't super up on her care - he thought she was a he!! lol. We have 3 beardies now and a BTS, loving this whole reptile thing, in fact, i'm trying super hard to refrain from getting more, but i have no more room at the inn!! lol.
Ha-ha....I didn't think the English language had changed that much ! And yes, I know how easy it is to see another critter and want to add to the " family" .