The byproduct of micro-filed calluses and dead skin that closely resembles canned, grated Parmesan cheese mixed with small amounts of grime or mold. Typically, it is discarded as non-biohazard medical waste or fed to pet dust mites.
Cindy: "Mom! Bobby dumped the stuff from your foot grater onto his spaghetti!"
Mom: “Oh Cindy… that’s just my cheesle. Mommy (and Daddy) can always make more, sweetie.”