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Glossary Skin Layers

refer to epidermis, dermis, and hypodermis in human skin

Skin layers, also known as layers of the skin or skin strata, refer to the three primary layers that make up human skin: the epidermis, dermis, and hypodermis (subcutaneous tissue). The epidermis is the outermost layer, providing a protective barrier; the dermis lies beneath it, containing connective tissue, hair follicles, and sweat glands; and the hypodermis is the deepest layer, composed mainly of fat and connective tissue, which insulates the body and absorbs shock.

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Research

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research 742 Augmentation of HGF signaling: Potential for enhancing hair follicle neogenesis and development in bioengineered skin

April 2016 in “Journal of Investigative Dermatology”

This study suggests that hepatocyte growth factor (HGF) may play a role in hair follicle neogenesis and that an HGF mimetic could enhance skin substitute development.

Ppp2r2a Knockout Mice Reveal That Protein Phosphatase 2A Regulatory Subunit, PP2A-B55α, Is an Essential Regulator of Neuronal and Epidermal Embryonic Development

research Ppp2r2a Knockout Mice Reveal That Protein Phosphatase 2A Regulatory Subunit, PP2A-B55α, Is an Essential Regulator of Neuronal and Epidermal Embryonic Development

12 citations , June 2020 in “Frontiers in Cell and Developmental Biology”

This study found that the PP2A-B55α regulatory subunit is crucial for ectodermal development in mice, with knockout embryos displaying severe neural and epidermal defects and failing to survive to birth.

research Three-Dimensional Printing in Trichology: A Narrative Mini-Review – Where Are We Now?

May 2026 in “Skin Appendage Disorders”

This review explores emerging 3D bioprinting strategies for hair follicle creation, highlighting their potential to advance alopecia treatment and trichology research, but notes the need for further optimization and reduced maintenance costs before clinical use.

Histologic Morphology and Involucrin, Filaggrin, and Keratin Expression in Normal Canine Skin from Dogs of Different Breeds and Coat Types

research Histologic morphology and involucrin, filaggrin, and keratin expression in normal canine skin from dogs of different breeds and coat types

15 citations , January 2012 in “Journal of Veterinary Science”

This study examined variations in epidermal thickness and protein expression across different dog breeds, finding significant differences by anatomical site and breed, with associated mRNA and protein expression changes observed.

research Construction strategies of skin organoids: A review

July 2026 in “Organoid Research”

In this review, researchers summarize key factors in constructing skin organoids, including cell source and assembly methods, and emphasize advances such as air-liquid interface culture for improving tissue development, aiming to guide standardized protocols and future clinical applications.

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Community Join

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community Androgenetic alopecia is a skin disease: DHT-mediated skin disorders

63 upvotes 2 years ago

Dihydrotestosterone (DHT) impacts various skin conditions, including Androgenetic alopecia and seborrheic dermatitis, by causing overactivity in sebaceous glands. Topical medications Tacrolimus and Clobetasol can reduce these inflammatory conditions, and treatments like RU58841, Minoxidil, and Finasteride may also be beneficial.

community Rejux-3x - the copper peptide combo that tressless overlooks.

1 upvotes 5 months ago

Rejuv-3X, a topical blend with GHK-Cu, AHK-Cu, and JXL-089, is used for hair loss, offering a targeted option without finasteride's side effects. The user plans to combine it with microneedling for enhanced results.

community Crazy body/facial hair on minoxidil - what to do?

4 upvotes 2 months ago

The user experienced significant hairline improvement using 10mg oral minoxidil and 0.5mg dutasteride daily but also saw increased body and facial hair growth. They are considering reducing the minoxidil dose due to side effects and exploring laser hair removal options.

community Microneedling + topical minoxidil is the most underrated combo.

439 upvotes 1 year ago

Microneedling with topical minoxidil is effective for hair regrowth, especially with finasteride. Users report fewer side effects compared to oral minoxidil.

community Lipisomal Solution (Dutasteride / Tretinoin & Minoxidil & Tretinoin) Horror Story Warning

in Update 12 upvotes 1 year ago

Using liposomal solutions with dutasteride, minoxidil, and tretinoin worsened hair loss due to buildup and scalp issues. Consulting a professional and returning to simpler treatments like finasteride and minoxidil improved the situation.

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Learn

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learn Melatonin

Can melatonin cause side effects on the skin or hair? Melatonin may cause hair loss or thinning in some users, but evidence is limited.

learn Scalp Micropigmentation

Does scalp micropigmentation work on all skin tones and hair colors? Scalp micropigmentation can be customized for various skin tones and hair colors.
Is scalp micropigmentation suitable for people with sensitive skin? Providers say scalp micropigmentation suits most skin types and describe patch tests, hypoallergenic pigments and a skin consultation for sensitive skin. These are provider claims rather than independent safety evidence, and pigment reactions remain a risk.

learn retinol

How does retinol improve scalp health and prepare the skin for other hair growth treatments? Retinol improves scalp health by promoting cellular turnover and reducing congestion.

learn Hyaluronic Acid

Does hyaluronic acid really hydrate the scalp, or is it mainly for skin care? Hyaluronic acid can hydrate the scalp, but its effectiveness may vary.

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Clinics

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Experts

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36
SMP Specialist
Noelle Skin
Nice, France

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Noelle Skin