Type I depressor septi muscles(62%) are visible and identifiable, and can be traced to full interdigitation with the orbicularis oris from their origin at the medial crural footplate.
They usually happen when things like dry air, smoke, or dehydration dry out some of the mucus that protects your nasal septum, that barrier that splits your nose into two nostrils.
Humans have pierced many parts of the body for jewelry: the ears, of course, and the nose (through either the septum or the nostrils) can be ornamented with studs or rings.