I was flossing my teeth the other day and I noticed that my tongue looked like a map of the world. It's sounds as if you have what is called 'geographical tongue', however, you should see your doctor or dentist to get this confirmed.
Geographical tongue occurs when areas of the tongue become smooth and pink and irregular in shape.
Against the normal furry surface of the tongue these areas create the appearance of a map, hence the name. No one really understands what causes it to happen in the first place but it doesn't need any treatment. In the majority of cases geographical tongue isn't painful. If it is then the changes you are seeing may well be due to another condition. Oral thrush can cause areas of the tongue to become sore and creamy white patches to appear as well.