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Related Concept Videos

Accessory Structures of the Skin: Hair Growth and Types01:20

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...
Accessory Structures of the Skin: Hair and Hair Follicles01:16

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...
Multipotency and Niche of Bulge Stem Cell01:06

Multipotency and Niche of Bulge Stem Cell

A hair follicle or HF is a small part of the skin that produces the hair shaft. Paul Gerson Unna was the first to observe a bulge in the human hair follicle's outer root sheath (ORS). The bulge is present between the sebaceous gland and the arrector pili muscle and is the niche for hair follicle stem cells (HFSCs). The bulge is also a niche for melanocyte stem cells, and their loss results in graying of hair. The HFSCs express Sox9 and Lhx2, which help them maintain stemness and prevent...
Hair Cells01:22

Hair Cells

Hair cells are the sensory receptors of the auditory system—they transduce mechanical sound waves into electrical energy that the nervous system can understand. Hair cells are located in the organ of Corti within the cochlea of the inner ear, between the basilar and tectorial membranes. The actual sensory receptors are called inner hair cells. The outer hair cells serve other functions, such as sound amplification in the cochlea, and are not discussed in detail here.

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Protocol to Create Chronic Wounds in Diabetic Mice
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Published on: September 25, 2019

Hair removal.

Merete Haedersdal, Christina S Haak

    Current Problems in Dermatology
    |August 26, 2011
    PubMed
    Summary
    This summary is machine-generated.

    Optical devices like lasers and intense pulsed light (IPL) offer efficient hair reduction by targeting melanin. While effective short-term, long-term results vary by device, requiring personalized treatment for safety and efficacy.

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    Area of Science:

    • Dermatology
    • Aesthetic Medicine
    • Biomedical Engineering

    Background:

    • Optical devices are the most efficient method for unwanted hair reduction.
    • Photothermal destruction of hair follicles is the core principle, utilizing specific wavelengths to target melanin.

    Purpose of the Study:

    • To review the efficacy and safety of various optical devices for hair removal.
    • To discuss patient selection, treatment parameters, and evolving consumer technologies.

    Main Methods:

    • Review of scientific literature on laser and intense pulsed light (IPL) hair removal.
    • Analysis of evidence for short-term and long-term efficacy.
    • Discussion of safety considerations and patient factors.

    Main Results:

    • Substantial short-term (up to 6 months) efficacy demonstrated for most systems.
    • Long-term efficacy (beyond 6 months) supported for alexandrite, diode, and Nd:YAG lasers; sparse evidence for IPL.
    • Optimal patient profile: thick dark hair, white skin, normal hormonal status.

    Conclusions:

    • Laser and IPL hair removal are generally safe when performed by trained professionals.
    • Personalized treatment parameters, including wavelength and cooling, are crucial for safety, especially in darker skin types.
    • Evolving consumer home-use devices offer new avenues for hair removal treatments.