Brown bumps on new whites tree frog

[Missfrog]

Just got a new White’s tree frog at petco (I felt bad for him he was the only one in the tank) my other 3 whites I got from a good breeder. Well she has some bumpy small brown spots on her back. Never seen this before so I’m a little worried because of getting her from a pet store and I don’t want any of my other frogs getting sick. She is hopping around and eating so nothing weird with that just the marks.of anyone has any info on the matter or maby clarification on it being a normal occurrence would be much appreciated!