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Accessory Structures of the Skin: Hair and Hair Follicles

Accessory Structures of the Skin: Hair and Hair Follicles

Hair and hair follicles are integral components of the integumentary system. Hair is a filamentous structure composed mainly of a protein called keratin. It is found on the surface of the skin throughout the body, except for areas such as the palms of the hands and soles of the feet.
Hair is a keratinous filament growing out of the epidermis. It is primarily made of dead, keratinized cells. Hair strands originate at the epidermal penetration called the hair follicle. The hair shaft is the part...

Accessory Structures of the Skin: Hair Growth and Types

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Hair growth begins with the production of keratinocytes by the basal cells of the hair bulb. As new cells are deposited at the hair bulb, the hair shaft is pushed through the follicle toward the surface. Keratinization is completed as the cells are pushed to the skin surface to form the shaft of hair that is externally visible. The external hair is completely dead and composed entirely of keratin. Hair can be cut or shaven without damaging the hair structure because the cut is superficial. Most...

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Related Experiment Video

Updated: Jun 18, 2026

Using a 1064-nm Picosecond Neodymium-Doped Yttrium Aluminum Garnet Laser for Periorbital Hyperpigmentation

Using a 1064-nm Picosecond Neodymium-Doped Yttrium Aluminum Garnet Laser for Periorbital Hyperpigmentation

Published on: May 23, 2025

[Laser hair removal].

T Michaud¹, B Tack

¹michaud.derm@evhr.net

Annales De Dermatologie Et De Venereologie

|November 26, 2009

Summary

This summary is machine-generated.

Laser hair removal and pulsed flashlamp treatments are established procedures. This review covers their theory, devices, results, and potential complications for medical and aesthetic use.

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Area of Science:

Dermatology
Aesthetic Medicine
Photomedicine

Context:

Laser hair removal and pulsed flashlamp technologies are widely used for hair reduction.
Established treatment protocols allow for predictable outcomes.
Understanding the underlying principles is crucial for safe and effective application.

Purpose:

To review the theoretical basis of laser and pulsed light hair removal.
To describe currently available devices for these procedures.
To inform patients about expected results and potential complications.

Summary:

The principles of laser and pulsed flashlamp hair removal are explained.
Available devices and their applications in medical and aesthetic settings are discussed.
Treatment outcomes and potential adverse effects are detailed, emphasizing theoretical understanding.

Impact:

Provides clear, evidence-based information for patients considering hair removal treatments.
Enhances understanding of the technology for practitioners, improving patient counseling.
Contributes to the safe and effective application of light-based hair removal methods.