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Here are some causes of Infected Koilonychia: 1  trauma. 2  illness. 3  malnutrition. or any major metabolic condition,  chemotherapy or other damaging event.
Petechiae: A red spot due to the escape of a small amount of blood. See detailed information below for a list of 85 causes of Petechiae, Symptom Checker, including diseases and drug side effect causes. Causes of Petechiae: The following medical conditions are some of the possible causes of Petechiae. There are likely to be other possible causes, so ask your doctor about your symptoms. 1  Trauma.  Idiopathic thrombocytopenia (type of Thrombocytopenia)