The good news is that mushrooms are typically an indicator of healthy, organic material in your soil. If you want to get rid of them out of risk of ingestion (or smell), try aerating your lawn. Mushrooms could be growing due to very damp conditions and poor water absorption, which aeration could improve. If you have a pet, you may need to be a little more diligent about picking up after them, pet waste left on lawns can be a breeding ground for mushrooms.