Generally people carve out potato blemishes, and blight spots, and rotten parts, and smelly parts and butchers will carve out cancerous growths. It's a standard

Generally people carve out potato blemishes, and blight spots, and rotten parts, and smelly parts and butchers will carve out cancerous growths. It's a standard practice, something that humans do, partly do to our sense of disgust. Our senses are not always correct, but most of the time it's a good survival adaptation to avoid rotten food and getting sick.