When Should You Worry?
Okay! Here is the nitty gritty: white stuff = good; gray-green or funky ooze = seriously bad.
If it smells off, if it feels slimy before you cook it, or the juices that run from the chicken are brown, greenish or grayish — that’s when you should march it politely but firmly to the trash.
A few signs to look out for:
Quotes From Smell (sour milk, rotten eggs)
Discoloration before cooking
Icky dry mouth feel before even hitting the pan
Trust your senses. “If anything seems odd, don’t take a chance,” he said. Your gut (pun intended) is often right about the yuck of the chicken.

Can You Prevent the White Stuff?
Fine, then, so long as it’s not actively damaging and it’s on to another. Maybe you’re like me and you don’t love how it looks. Fair. There are a few ways to limit it:
Cook low and slow:
When it’s super-hot out, muscle fibers do pick up the pace and squeeze out moisture more quickly. More high heat = more aggressive contraction = more gunk (also, more flavored brown bits on bottom).
Brine your chicken:
You should brine your chicken in a simple saltwater solution (yes, it’s extra prep work, but it’s simple enough to do), and it will help the muscle hold on to more water, which leaves you with a bit of extra liquid when it comes time to cook your chicken.
Don’t overcrowd the pan:
Give your chicken some space to breathe. Too full = steam = more moisture released = more of the white stuff.
Pat your chicken dry before cooking:
You can also remove some of the liquid that’s on the surface of your chicken. Pat it dry on a paper towel before it goes into the pan.
Naturally, should you do all that, you may still occasionally see the odd speck of white stuff. You know, that’s biology; that’s biology.

Is This a Chicken-Only Thing?