[cypher]

It's quite unlikely that a beetle would have come in from outside & got into the cage, more likely to be something in the food I would guess, it may just be a one off so have a look through the cage & keep an eye out for any more just in case.
It would probably be a good idea to freeze the food for at least a week just in case there are any eggs or anything in there, it's not a bad idea to do that routinely to avoid any chance of bugs!
Croos post!
The fur loss may not be related to the beetle but just keep an eye on that & see how it goes.