Exogenous Factors in Hair Disorders

January 2004 in “ Exogenous dermatology ”

Liran Horev

alopecia traction alopecia hair breakage hair loss hair structure hair growth cycle weathering copper dermatological treatments conditioners styling products chemical processes thermal tools solar radiation X-irradiation sunscreen hair damage hair care hair protection

Studysummary This review discusses the impact of various external factors like cosmetics, traction, and radiation on hair health and color, but reports no new findings.

Our plain-language summary. Not medical advice or a treatment recommendation. Consult a qualified healthcare professional before changing treatment. Full disclaimer

The 2004 document reviews how exogenous factors such as grooming practices, chemical treatments, and environmental exposures can damage hair, leading to disorders like alopecia and changes in hair appearance. It details the hair structure and growth cycle, explaining that damage, or 'weathering', can occur from everyday activities and that hair can be affected by substances like copper or by trauma and dermatological treatments. Cosmetic products can either protect or damage hair, with conditioners reducing friction and damage, while styling products may build up or cause allergic reactions. Chemical processes, if overused, can cause hair breakage and loss, and physical styling can lead to traction alopecia. Thermal tools and solar radiation can degrade hair proteins and pigments, while X-irradiation can cause alopecia. The document emphasizes the importance of proper hair care to prevent damage, as hair does not repair itself, and suggests new sunscreen classes for hair protection. It does not provide specific study participant numbers, indicating it is a general review rather than a new study.

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