, and the tongue is one of the sites where they may develop. … oral cavity are relatively common in general practice, with estimates suggesting that up to 4% of the population in the United States suffer from some form of ulcerative lesion … 
A lesion of geographic tongue may start as a white patch before the depapillation occurs.
Other than the lesions themselves, the tongue exhibits no signs of inflammation and patients are many times concerned about aesthetic reasons.
Unlike glossitis due to nutritional deficiencies and anemia, the lesions of geographic tongue move around the tongue over time.
If there are lesions on the tongue, speaking and chewing can be uncomfortable, and ulcers on the soft palate, back of the throat, or esophagus can cause painful swallowing … 
Pellagra is a systemic disease caused by a deficiency in the B vitamin niacin (also known as vitamin B3 or nicotinic acid). However, it can also be brought about by poorly-balanced intake of amino acids. Pellagra is characterized by the classical symptoms of dermatitis, diarrhea and dementia. Pellagra is characterized…
Oral leukoplakia is a white patch or plaque that develops in the oral cavity and is strongly associated with tobacco smoking. More importantly, it is widely recognized as a precancerous lesion of oral squamous carcinoma. Oral leukoplakia has a wide differential diagnosis, which is why an extensive workup is necessary…