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GlossaryTrichorrhexis Nodosa (knotted hair)

hair shaft disorder causing weak points and easy breakage

Trichorrhexis Nodosa is a hair shaft disorder characterized by the presence of weak points or nodes along the hair strand, leading to easy breakage and split ends. This condition can be caused by genetic factors, physical or chemical trauma to the hair, or underlying medical issues, and it often results in hair that appears frayed or uneven.

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research Trichonodosis in a Patient with Straight Hair

3 citations, October 1990 in “Journal of the American Academy of Dermatology”

Mechanical trauma like towel drying can cause knotted hair even in straight hair.

research The Proteomic Profile of Hair Damage

20 citations, June 2012 in “British Journal of Dermatology”

Bleaching hair damages protein structure, especially keratin, leading to weakened hair.

research Office Diagnosis of Hair Shaft Defects

33 citations, March 2006 in “Seminars in cutaneous medicine and surgery”

The document explains how to identify different hair problems using a microscope.

research Light Microscopy of the Hair: A Simple Tool to Untangle Hair Disorders

24 citations, January 2011 in “International Journal of Trichology”

Light microscopy is useful for diagnosing different hair disorders.

research The Hair Shaft: Normality, Abnormality, and Genetics

11 citations, March 2001 in “Clinics in Dermatology”

Hair microscopy is useful for diagnosing hair disorders, but clear definitions are needed for accurate genetic analysis.

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community 1 year hair transplant

in Transplants 419 upvotes 4 years ago

A user's experience with a hair transplant, as well as the use of finasteride to maintain results.