- Alopecia is defined as loss of hair from body areas where it is normally found.
- Hypotrichosis is often used interchangeably with alopecia; also defined as less than normal amount of hair; best reserved for congenital hair loss.
- Hair loss is characterized by amount of loss, distribution, and presence or absence of inflammation.
- Loss of individual hairs in an area can be partial or complete
- Hair loss can vary in distribution and extent:
- Focal, well-circumscribed areas
- Multifocal or diffuse patchy areas
- Diffuse/generalized hair loss
- Areas of hair loss can be inflammatory or noninflammatory
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