Idiopathic thrombocytopenic purpura with black oral mucosal lesions.

Idiopathic thrombocytopenic purpura (ITP) is an acquired autoimmune disorder in which autoantibodies are made against platelets, causing accelerated platelet destruction. History and physical examination are most often normal except for petechiae, commonly seen in the lower extremities. Hemorrhagic bullae of mucous membranes can indicate the presence of severe thrombocytopenia.

Scurvy in a patient with presumptive oral lichen planus.

Scurvy is a disease caused by vitamin C deficiency. In this study, a patient with scurvy is presented with soreness and ulcerations of the mouth that were previously diagnosed as oral lichen planus. This disease is relatively more common than scurvy in the United States.