Rare: Allergic fungal sinusitis is a rare disease. The nasal drainage can be dark colored (dark yellow, green or brown), but some patients do not have any nasal drainage at all and still have fungal sinusitis.
Answered 8/17/2016
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Doubt fungal, see MD: Sinusitis is very rarely caused by fungi, except in people with uncontrolled diabetes or advanced immunodeficiency such asend-stage AIDS, terminal cancer, etc. The chance you have fungal sinusitis is very low. It doesn't cause any different mucusdischarge than any other nasal or sinus infection. There is no point in trying to self diagnose such a problem. See your doctor.
Answered 12/20/2017
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