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Accessory Structures of the Skin: Hair Growth and Types

Accessory Structures of the Skin: Hair Growth and Types

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: May 15, 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: a review.

Stephanie D Gan¹, Emmy M Graber

¹School of Medicine, Boston University and Boston Medical Center, Boston, Massachusetts, USA.

Dermatologic Surgery : Official Publication for American Society for Dermatologic Surgery [Et Al.]

|January 22, 2013

Summary

Laser hair removal offers an effective solution for unwanted hair growth. Different laser systems, including Nd:YAG for darker skin, provide long-term hair reduction.

Area of Science:

Dermatology
Aesthetic Medicine
Laser Technology

Background:

Unwanted hair growth is a prevalent aesthetic concern.
Laser hair removal is a primary method for achieving long-term hair reduction.

Purpose of the Study:

To review the scientific literature on laser hair removal.
To examine the theoretical underpinnings, devices, and complications.
To provide treatment guidelines for darker skin types.

Main Methods:

Comprehensive literature search.
Focused on long-pulse alexandrite (755 nm), diode (810 nm), neodymium-doped yttrium aluminum garnet (Nd:YAG; 1,064 nm), and intense pulsed light (IPL) systems.
Included evaluation of home-use devices.

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Apparatus for Harvesting Tissue Microcolumns

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Published on: October 25, 2018

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Last Updated: May 15, 2026

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Published on: May 23, 2025

Enhancement of Facial Rejuvenation Through a Combination of 1565 nm Non-Ablative Fractional Laser with 30% Supramolecular Salicylic Acid

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Apparatus for Harvesting Tissue Microcolumns

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Published on: October 25, 2018

Main Results:

Alexandrite, diode, Nd:YAG, and IPL devices are supported for long-term hair removal.
Nd:YAG lasers are optimal for pigmented skin due to their longer wavelength.
Further research is required for home-use device safety and efficacy.

Conclusions:

Current in-office laser hair removal technologies provide durable results for unwanted hair.
Effective long-term hair removal is achievable with established laser systems.