Looking for green or white spots on the queso fresco is one of the most significant ways to tell whether it’s rotten. If the cheese is white or minor, this mold may go undetected, but if it is present, it will be visible. If you observe one of these things, toss the cheese out right away. Otherwise, it may be already gone, not lovely.
The expiration date is the first item to look for. If the cheese is frozen, it should be consumed within a few days of being defrosted.