Follicle

Here you can see how the follicle has become irritated.

DNA testing, the analysis of human biological material, is reshaping America's criminal justice system. Deoxyribonucleic acid is the repository of genetic information that resides in our cells, and no two people — not even identical twins — have the same DNA. In criminal investigations, DNA can be extracted from many sources, a single hair follicle — a drop of blood, other bodily fluids, or a microscopic fingernail scraping.

He could feel the follicles in his inner ear go crazy.