Darkness from moisture in a poultice application can wick out beyond the original stained area. This is not a stain, and the problem is easy to resolve.
There are a number of reasons why benchtop cloudiness or haze can develop. Here are the details about possible causes and solutions for the problem.
Stone countertops, continually exposed to oily or dye-containing substances, are subject to staining. Read this article to learn about countertop protection.
Some natural stones that are definitely not granite are being sold as if they were. Here are some ways you may be able to tell whether it really is granite.
Learn how to clean up bird droppings on natural stone, remove the stains that may persist after cleaning, and avoid having to do the same thing again next week.