What causes belly button lint?

Answer 1

Many people find that, at the beginning and end of the day, a small lump of fluff has appeared in the navel cavity. The reasons for this have been the subject of idle speculation for many years but in 2001, Dr. Karl Kruszelnicki of the University of Sydney, Australia undertook a systematic survey to determine the ins and outs of navel lint. His primary findings were as follows:

• Navel lint consists primarily of stray fibres from one's clothing, mixed with some dead skin cells and strands of body hair. The rotting cells can create unpleasant odors.
• Contrary to expectations, navel lint appears to migrate upwards fromunderwear rather than downwards from shirts or tops. The migration process is the result of the frictional drag of body hair on underwear, which drags stray fibres up into the navel.
• Women experience less navel lint because of their finer and shorter body hairs. Conversely, older men experience it more because of their coarser and more numerous hairs.
• Navel lint's characteristic blue-gray tint is likely the averaging of the colors of fibres present in clothing; the same color as clothes dryer lint.
• The existence of navel lint is entirely harmless, and requires no corrective action.

Answer 2

Belly button lint is primarily made up of fibers from clothing that rub against the area and get trapped, along with dead skin cells and body oils. The shape of the belly button can contribute to the collection of lint, as well as the type of clothing worn.