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Hair and scalp disorders 

Hair and scalp disorders
Chapter:
Hair and scalp disorders
DOI:
10.1093/med/9780199208388.003.14
Page of

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date: 25 January 2021

Introduction214

Investigations215

Hair loss (alopecia)216

Structural abnormalities of hair shaft218

Scalp lesions220

Scalp infections222

Scalp infestations224

Inflammatory dermatoses of scalp226

Changes in hair colour228

Algorithm for hair loss228

Hirsutism229

Hypertrichosis230

Hair is found all over the body except for palms, soles and mucosal surfaces. It is modified in different body sites to form scalp, eyebrow, eyelash and nasal hairs all of which provide protection. At puberty, secondary sexual development causes a growth of pubic and axillary hair and in the male, increased coarse facial hair. The cycle of hair growth undergoes three phases, which are shown in ...

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