Snot is the most unpleasant, irritating, nasty, backbreaking and at the same time fairly frequent nasal illness. Everything begins from sinus infection. If the infection in the nose occurs, the nose becomes inflamed and fluid escapes. Because of the area infected, a patient needs to blow the nose repeatedly. In the napkin, there will be some rheum necessarily and its color may change from green to yellow. This rheum comes from the infected sinuses right into the nasal passages.