Stuff you breathe?: Usually this can be due to inhalation of pollutants in the air such as dust, smoke, or other environmental pollutants. Rarely certain serious fungal sinus infections in persons with a compromised immune system can cause black discharge from the nose (invasive fungal sinusitis).
Answered 8/11/2015
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A doctor has provided 1 answer
A doctor has provided 1 answer
A doctor has provided 1 answer
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