The small bumps on the tongue responsible for identifying taste are normal, but there might be a reason to worry if you witness large bumps. Although it should heal on its own, if it has been more than a few days and your condition is becoming worse, it could be due to a tongue injury, infection, irritation, cancer, or allergies.  You might also have a cobblestone throat where the person suffering from it has extra mucus dripping down their throat. But it's pretty easy to get this condition treated.  Only in rare cases could it be a sign of tongue cancer.