That's frost, not mold.
For stored bud to start to turn moldy it has to be sealed for a couple weeks. If you are worried about mold then you must think your bud needs to be drier.
Leave the bud out at night and check it every morning. When you get to the point where you are happy with it you can seal her up for a week. Check again after a week
and once a week afterwards. Tossing out moldy bud is expensive and everyone should suffer that fate no more than once.
Good luck, BigSteve.