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Glossary Confocal Microscopy

uses laser light to create detailed, three-dimensional images

Confocal Microscopy, also known as Confocal Laser Scanning Microscopy (CLSM), is an advanced imaging technique that uses laser light to scan samples and create high-resolution, three-dimensional images. By focusing on a specific plane within the sample and excluding out-of-focus light, it provides clearer and more detailed images than traditional microscopy, making it particularly useful for studying complex structures like hair follicles and skin tissues in both research and medical diagnostics.

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research Characterization and quantification of wound-induced hair follicle neogenesis using in vivo confocal scanning laser microscopy

26 citations , April 2011 in “Skin Research and Technology”

This study found that in vivo confocal scanning laser microscopy accurately quantifies neogenic hair follicles in mice, producing results similar to histology while avoiding fixation artifacts.

Hair Regrowth Boosting Via Minoxidil Cubosomes: Formulation Development, In Vivo Hair Regrowth Evaluation, Histopathological Examination, and Confocal Laser Microscopy Imaging

research Hair regrowth boosting via minoxidil cubosomes: Formulation development, in vivo hair regrowth evaluation, histopathological examination and confocal laser microscopy imaging

February 2023 in “International Journal of Pharmaceutics”

In this study, the researchers developed minoxidil cubosomes using nanotechnology, which improved drug penetration in the skin, showed greater hair growth efficacy, and reduced adverse skin reactions compared to traditional minoxidil solutions.

Investigation of the Cutaneous Penetration Behavior of Dexamethasone Loaded to Nano-Sized Lipid Particles by EPR Spectroscopy, and Confocal Raman and Laser Scanning Microscopy

research Investigation of the cutaneous penetration behavior of dexamethasone loaded to nano-sized lipid particles by EPR spectroscopy, and confocal Raman and laser scanning microscopy

21 citations , December 2016 in “European journal of pharmaceutics and biopharmaceutics”

This study found that nano-sized lipid particles improved the skin accumulation and retention of dexamethasone compared to a base cream, suggesting potential benefits for inflammatory skin disease treatment.

research Confocal Laser Scanning Microscopy: An Excellent Tool for Tracking Compounds in the Skin

5 citations , November 2005

This review discusses the applications of confocal laser scanning microscopy in visualizing fluorescent compounds within the skin, noting its potential for tracking drug carriers and enhancing penetration studies, but reports no new results.

research Confocal Laser Scanning Microscopy as a Tool for the Investigation of Skin Drug Delivery Systems and Diagnosis of Skin Disorders

4 citations , March 2013 in “InTech eBooks”

Confocal Laser Scanning Microscopy (CLSM) is a useful tool for studying how drugs interact with skin and diagnosing skin disorders, despite some limitations.

research Evaluation of Skin Penetration of Fluorescent Dissolved Formulations Using Confocal Laser Scanning Microscopy

2 citations , November 2025 in “Pharmaceutics”

This study found that a CLSM-based approach could semi-quantitatively assess the transdermal penetration behavior of fluorescent dyes with different lipophilicities, offering a tool for early-stage screening of compound penetration.

research Development and Skin Penetration Pathway Evaluation Using Confocal Laser Scanning Microscopy of Microemulsions for Dermal Delivery Enhancement of Finasteride

1 citations , December 2022 in “Pharmaceutics”

This study found that finasteride-loaded microemulsions using poloxamer 124 significantly enhanced skin penetration of the drug compared to a standard solution, primarily through targeting hair follicles via the transfollicular pathway, with intercluster, intercellular, and transcellular pathways contributing less.

research Investigations on the penetration of hydrolyzed wheat proteins into human hair by confocal laser-scanning fluorescence microscopy

11 citations , January 2000 in “Journal of cosmetic science”

This study found that hydrolyzed wheat proteins extensively penetrated both untreated and chemically treated hair, primarily occupying areas like the endocuticle and cortex.

Development of Topical Formulations Containing 20% Zinc Oxide Nanoparticles: Stability Assessment and Penetration Evaluation

research Development of Topical Formulations Containing 20% of Coated and Uncoated Zinc Oxide Nanoparticles: Stability Assessment and Penetration Evaluation by Reflectance Confocal Laser Microscopy

September 2023

In this study, formulations containing 20% zinc oxide nanoparticles demonstrated stability and improved spreadability without penetrating the deepest skin layers, instead accumulating in skin furrows and hair follicles.

research Use of confocal microscopy for nanoparticle drug delivery through skin

57 citations , December 2012 in “Journal of Biomedical Optics”

This review discusses the application of confocal laser scanning microscopy for studying nanoparticle interactions with skin and highlights its potential for broad applications, but reports no new experimental findings.

research Reflectance Confocal Microscopy of Adult Periorificial Dermatitis: A Case Report

July 2023 in “Clinical, cosmetic and investigational dermatology”

In this study, reflectance confocal microscopy was used to diagnose periorificial dermatitis, revealing specific skin changes such as hair follicle dilatation, increased vascular density, and inflammation, which help distinguish it from similar conditions.

Reflection Confocal Microscope Characteristics of Rosacea and Related Observations

research Reflection confocal microscope characteristics of rose acne and some thoughts caused by it

July 2022 in “Skin research and technology”

This report describes common skin CT features of rosacea identified using a reflective confocal microscope, facilitating more objective diagnosis but highlights the need for further clinical exploration.

research Lipid-based nanocarriers coupled with CO 2 laser-mediated drug delivery enhance skin penetration and hair follicle targeting

February 2026 in “Journal of drug targeting”

This study found that combining laser ablation with nanoparticulate drug formulations effectively enhanced the skin and follicular delivery of hydrophilic drugs like minoxidil and minocycline in preclinical models.

research Comparison of the efficacy and safety of a picosecond alexandrite laser and a Q-switched alexandrite laser for the treatment of freckles in Chinese patients

19 citations , August 2018 in “Journal of the American Academy of Dermatology”

In this study, the researchers found that the picosecond pulsed alexandrite laser (PSAL) may be as effective and safe as the Q-switched alexandrite laser (QSAL) for treating freckles in Chinese patients.

research Reactive keratin derivatives: A promising strategy for covalent binding to hair

20 citations , September 2018 in “Journal of colloid and interface science”

This study found that keratin derivatives with functionalized thiol groups improved binding to both natural and bleached hair fibers, suggesting a promising strategy for enhancing keratin's durability in hair repair.

research Diagnosis of Hair Disorders

73 citations , March 2009 in “Seminars in Cutaneous Medicine and Surgery”

This article reviews various diagnostic tools for hair disorders, describing methods ranging from invasive to noninvasive, but reports no new research findings or clinical results.

research Mechanistic study of decreased skin penetration using a combination of sonophoresis with sodium fluorescein-loaded PEGylated liposomes with D-limonene

2 citations , December 2015 in “DOAJ (DOAJ: Directory of Open Access Journals)”

This study found that low frequency sonophoresis may reduce percutaneous absorption of sodium fluorescein-loaded liposomes by partially blocking follicular pathways in the skin.

Lifting the Biofilm Lid on the Antibacterial and Antibiofilm Effects of Sodium Hypochlorite Against Staphylococcus Aureus in Atopic Dermatitis

research Lifting the biofilm lid on the antibacterial and antibiofilm effects of sodium hypochlorite against Staphylococcus aureus in atopic dermatitis

1 citations , August 2017 in “British Journal of Dermatology”

Sodium hypochlorite can effectively prevent and remove Staphylococcus aureus biofilms in atopic dermatitis at high enough concentrations.

research Montagna Symposium 2013—Light and Skin: How Light Sustains, Damages, Treats, Images and Modifies Skin Biology

1 citations , July 2014 in “The journal of investigative dermatology/Journal of investigative dermatology”

This review discusses various topics from the 62nd Annual Montagna Symposium on the Biology of Skin, focusing on the diverse effects of light on skin biology, and reports no new clinical results.

research Follicular transport route – Research progress and future perspectives

211 citations , February 2009 in “European journal of pharmaceutics and biopharmaceutics”

This review summarizes recent advancements in follicular targeting for drug delivery via hair follicles and calls for pilot studies in humans to explore potential clinical applications.

research Time and depth resolved visualisation of the diffusion of a lipophilic dye into the hair follicle of fresh unfixed human scalp skin

36 citations , July 2004 in “Journal of Controlled Release”

This study demonstrates that confocal laser scanning microscopy can effectively visualize the rapid diffusion and penetration pathway of a dye into the hair follicle in fresh human scalp skin.

research Polymeric Micelle Nanocarriers for the Cutaneous Delivery of Tacrolimus: A Targeted Approach for the Treatment of Psoriasis

159 citations , July 2014 in “Molecular pharmaceutics”

This study found that MPEG-dihexPLA micelles significantly improved the skin deposition of tacrolimus compared to a marketed ointment, suggesting better targeted delivery with reduced systemic absorption.

research Dendritic polyglycerol and N-isopropylacrylamide based thermoresponsive nanogels as smart carriers for controlled delivery of drugs through the hair follicle

62 citations , November 2016 in “Nanoscale”

In this study, researchers developed thermoresponsive nanogels that effectively penetrate hair follicles and release a model drug when triggered by temperature, demonstrating greater penetration for medium to large nanogels (300–500 nm) compared to smaller ones.

Penetration and Distribution of Three Lipophilic Probes in Human Skin Focusing on the Hair Follicle

research Penetration and distribution of three lipophilic probes in vitro in human skin focusing on the hair follicle

54 citations , October 2002 in “Journal of controlled release”

This study found that increasing a drug's lipophilicity and adding ethanol to the donor phase can enhance its delivery to the hair follicle, although the precise transport mechanism remains unclear.

research Selective delivery of adapalene to the human hair follicle under finite dose conditions using polymeric micelle nanocarriers

50 citations , December 2017 in “Nanoscale”

This study found that polymeric micelle formulations significantly improved the targeted delivery of adapalene to hair follicles compared to standard Differin® products, which suggests potential advantages in treating hair follicle-related conditions and reducing side effects.

research Permeant lipophilicity and vehicle composition influence accumulation of dyes in hair follicles of human skin

44 citations , April 2003 in “European journal of pharmaceutical sciences”

This study found that targeting the hair follicle can be increased by using lipophilic drugs combined with surfactant solutions and propylene glycol.

research Effect of liposomal fluidity on skin permeation of sodium fluorescein entrapped in liposomes

21 citations , July 2015 in “International Journal of Nanomedicine”

In this study, ultradeformable liposomes containing Tween 20 or terpenes increased phospholipid bilayer fluidity and enhanced skin penetration of sodium fluorescein, with terpenes improving hair follicle penetration.

research Gradient-dependent release of the model drug TRITC-dextran from FITC-labeled BSA hydrogel nanocarriers in the hair follicles of porcine ear skin

18 citations , October 2016 in “European Journal of Pharmaceutics and Biopharmaceutics”

In this study, FITC-labeled BSA nanocarriers delivered a model drug deeper into porcine ear skin hair follicles than the carriers themselves, as shown by confocal microscopy.

Mechanistic Analysis of Human Skin Distribution and Follicular Targeting of Adapalene-Loaded Biodegradable Nanospheres With Insight Into Hydrogel Matrix Influence, In Vitro Skin Irritation, and In Vivo Tolerability

research Mechanistic Analysis of Human Skin Distribution and Follicular Targeting of Adapalene-Loaded Biodegradable Nanospheres With an Insight Into Hydrogel Matrix Influence, In Vitro Skin Irritation, and In Vivo Tolerability

17 citations , June 2017 in “Journal of pharmaceutical sciences”

This study found that adapalene-loaded nanospheres in a hyaluronic acid gel enhanced skin penetration and were nonirritant, making them potentially suitable for treating acne on oily skin.

research Determination of the pH Gradient in Hair Follicles of Human Volunteers Using pH-Sensitive Melamine Formaldehyde-Pyranine Nile Blue Microparticles

13 citations , September 2020 in “Sensors”

This study used melamine formaldehyde particles to measure a pH gradient along the hair shaft, showing a significant pH decrease from the hair sheath to the external shaft.