Bubbly or blistered cheese on a freshly baked pizza is usually completely normal: as the pizza cooks, moisture turns into steam and can become trapped beneath the melted cheese, creating bubbles that may brown or blister under intense heat. Different cheeses, toppings, dough, and oven temperatures can affect how much bubbling occurs, so the appearance alone does not mean the pizza is spoiled; instead, watch for warning signs such as mold, a rotten smell, or improper storage.
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