The fear (justified or not) of having a booger protruding, hanging, dangling, stuck to or smeared on one's own nose or nostril.
Cures: The only known remedy for this affliction is to seek out a mirror immediately. The word of friends or family will do nothing to assuage the mounting panic the sufferer displays, which will generally manifest itself in frantic and overly-frequent rubbing of the nose or nostril(s)
1st person: "Do I have a booger hanging from my nose?
2nd person: "I don't see anything. You must be suffering from Mucophobia."
1st person: "Did you see a mirror in the bathroom?"
The fear of speaking off the cuff or from the heart, the terror of having to say the wrong thing and watch someone's smile fade as they realize you aren't the person they thought you to be