
A nasal septum perforation is a medical condition in which the nasal septum, the cartilaginous membrane dividing the nostrils, develops a hole or fissure. This may be brought on directly, as in the case of nasal piercings, or indirectly, as by long-term topical drug application, including intranasal ethylphenidate, methamphetamine, cocaine or deco...
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http://en.wikipedia.org/wiki/Nasal_septum_perforation

Nasal septum perforation: A hole in the nasal septum, the wall inside the nose that runs down the middle dividing it into two sides. The hole provides a direct communication between the two normally-separate sides of the nose. Perforation of the nasal septum can be due to trauma (such as a blow to the nose, picking the nose, etc), drug abuse (as, f...
Found on
http://www.medterms.com/script/main/art.asp?articlekey=13879
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