Please help! What is the difference between geographical and fissured tongue?

Different. Geographic tongue, or glossitis, is when you have red or light patches that seem to change location on the tongue. It is thought that a deficiency of vitamin b can contribute, but there is no known cause. It is common and harmless. Fissured tongue is also harmless and shows up as deep cracks between the papilla. Sometimes geographic tongue may accompany fissured tongue.