Insect bites or minor skin injuries: Bites, scratches, or small wounds can irritate hair follicles, causing inflammation. If bacteria enter the follicle, it may lead to infection and pus-filled bumps.

Furuncles (boils) - develop when a hair follicle becomes deeply infected, leading to a large, painful lump filled with pus. Carbuncles - are clusters of furuncles that form a larger infected area ...

Demodex mites are tiny eight-legged parasites that mostly live in hair follicles and oil glands on your face, neck, or chest. As alarming as this may sound, they’re generally harmless.

Eyelash mites such as Demodex folliculorum are tiny parasites that live in or near the hair follicles. This article covers the causes, symptoms, and treatments.

During the catagen phase, your follicle shrinks. Your hair breaks away from your follicle base but remains “rooted” in place. This transitional phase usually lasts from 10 days to several weeks.