melanotic macule roof of mouth Oral Macule: Symptoms and Treatment Pigmented Oral Lesions: Clues to

However, research on the potential effects of vitamin B12 on weight loss has turned up mixed results

When it does happen, you usually have another condition such as: Endocrine disorders, such as Addison's disease, Cushing's syndrome, and hyperthyroidism Lupus Metabolic disorders, such as alcaptonuria Hyperbilirubinemia (in which you can't break down bilirubin) Rare genetic problems, such as porphyria, Touraine syndrome, or Laugier-Hunziker syndrome Tumors Active melanocytes can form longitudinal melanonychia because of noncancerous and cancerous tumors

The American Journal of Psychiatry, 152 (5), 792794

Beck and colleagues in Montreal, in the late 1950s