My Beardy has a yellow butt!!

Question
I have 2 bearded dragons that are about 1-2 months old. I've noticed recently that the one that i believe to be a female has like a yellowish stain on her behind. The other, which should be a male, doesn't have this. I have tried giving her a bath and cleaning it off but it doesn't go away. . .other than that she seems to be very healthy. Is this something i should be concerned about?

Answer
 Have they been seen by a reptile vet for their well-baby check up?  If so, were any antiparasite drugs given?  If not, have the vet check that for a fungus.  Chances are, the white scales are just a little poop stained. A fresh shed will remove that.