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Hair and scalp disorders 

Hair and scalp disorders
Hair and scalp disorders
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date: 25 January 2021



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



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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