I can't tell from your profile if you're male or female, so I'll throw in something from left field. As a female, I've learned that the eyes, sinuses, and mouth are all connected. If I wear eyeliner and it migrates to my my tear duct, I cough up or blow my nose and see specks of that color. (I have allergies.) Seeing black and brown was initially alarming, but I had a good laugh when cyan blue came out of my facial orifices. For DAYS. 
