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How is an ingrown hair best defined?

  1. A hair that has fallen out

  2. A hair that is blocked by skin over the follicle opening

  3. A hair growing in a spiral direction

  4. A hair that is excessively thick

The correct answer is: A hair that is blocked by skin over the follicle opening

An ingrown hair is best defined as a hair that is blocked by skin over the follicle opening. This occurs when hair grows back into the skin instead of out through the follicle, leading to inflammation and sometimes infection. When the follicle is blocked by skin, the hair cannot emerge properly, which is a key characteristic of ingrown hairs. Other options describe hair conditions but do not accurately represent an ingrown hair. A hair that has fallen out is not relevant to the definition of an ingrown hair, as it implies there is no active growth. A hair growing in a spiral direction pertains to the hair's growth pattern rather than its relationship with the skin. A hair that is excessively thick may suggest a different hair texture or type but does not reflect the issue related to an ingrown hair. Therefore, the most accurate definition involves the obstruction of the hair follicle by skin.