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Related Concept Videos

Acne Infection01:27

Acne Infection

Acne is a multifactorial skin condition primarily affecting adolescents and young adults, with a global prevalence estimated to exceed 75% in this demographic. The condition is characterized by the formation of comedones (blackheads and whiteheads), papules, pustules, nodules, and, in severe cases, cysts, particularly in areas rich in sebaceous glands such as the face, neck, chest, and back. The pathogenesis involves increased sebum production, follicular hyperkeratinization, colonization by...
Accessory Structures of the Skin: Sebaceous Glands01:21

Accessory Structures of the Skin: Sebaceous Glands

A sebaceous gland is a type of oil gland found almost all over the skin ( except palms and soles) and helps lubricate and waterproof the skin and hair. Most sebaceous glands are associated with hair follicles. They generate and excrete sebum, a mixture of lipids, onto the skin surface, thereby naturally lubricating the dry and dead layer of keratinized cells of the stratum corneum, keeping it pliable.
These glands that produce the oils on the skin and hair are holocrine glands. The mature...
Asthma: Pathogenesis and Management01:20

Asthma: Pathogenesis and Management

Asthma is a chronic pulmonary condition involving inflammation of the airways, hyper-reactivity, and reversible obstruction of the airways. This condition can significantly impact a person's quality of life, making breathing difficult and leading to distressing symptoms.
Asthma is classified as allergic and non-allergic. Allergens such as dust mites, pollen, and pet dander trigger allergic asthma, while factors like cold air, intense emotions, or exercise can induce non-allergic asthma.
Asthma-II: Pathophysiology and Classification01:26

Asthma-II: Pathophysiology and Classification

Asthma is a prevalent chronic respiratory condition marked by inflammation and hyperresponsiveness of the airways. Its pathophysiology involves complex interactions among inflammatory pathways, immune responses, and neural mechanisms.
Additionally, environmental and genetic factors play crucial roles in determining an individual's susceptibility to asthma and the severity of their condition.
Critical processes in asthma pathophysiology include:
The Skin Microbiota01:27

The Skin Microbiota

The human skin serves as a complex ecosystem inhabited by a diverse community of microorganisms, including bacteria, fungi, and viruses. This microbiome plays a critical role in maintaining skin health and defending against pathogenic invaders. The composition of microbial communities varies significantly across different regions of the body, influenced primarily by the local levels of moisture and sebum.Regional Variation in Skin MicrobiotaCutibacterium acnes predominantly colonizes sebaceous...
Asthma I: Introduction01:28

Asthma I: Introduction

Asthma is a chronic inflammatory disorder of the airways characterized by variable airflow obstruction and heightened bronchial responsiveness to a wide range of triggers. The underlying inflammation leads to airway swelling, mucus hypersecretion, and smooth muscle constriction, all of which narrow the airway lumen and impede airflow. Clinically, asthma presents with recurrent episodes of wheezing, shortness of breath, chest tightness, and coughing, symptoms that typically vary in intensity and...

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Related Experiment Video

Updated: Jun 11, 2026

A Rat Model of Compound Acne
03:10

A Rat Model of Compound Acne

Published on: November 1, 2024

Acne epidemiology and pathophysiology.

Sheila F Friedlander1, Lawrence F Eichenfield, Joseph F Fowler

  • 1Rady Children's Hospital, UCSD School of Medicine, San Diego, CA, USA. sfriedlander@rchsd.org

Seminars in Cutaneous Medicine and Surgery
|July 9, 2010
PubMed
Summary
This summary is machine-generated.

Facial acne vulgaris onset is occurring earlier than previously observed, with 12 years no longer the typical starting age. Further research is needed to understand the causes and implications of this demographic shift in acne presentation.

Related Experiment Videos

Last Updated: Jun 11, 2026

A Rat Model of Compound Acne
03:10

A Rat Model of Compound Acne

Published on: November 1, 2024

Area of Science:

  • Dermatology
  • Pediatric Medicine
  • Epidemiology

Background:

  • The demographic profile of facial acne vulgaris has shifted, with onset occurring earlier than the traditional ~12 years of age.
  • Epidemiologic evidence suggests a downward trend in the typical age of acne onset over recent decades.

Purpose of the Study:

  • To investigate the changing demographic profile of facial acne vulgaris.
  • To explore the potential influence of earlier puberty onset on acne presentation.
  • To understand the pathophysiologic changes in acne in younger pediatric patients.

Main Methods:

  • Review of existing epidemiologic evidence on acne vulgaris onset.
  • Analysis of trends in acne vulgaris demographics over several decades.
  • Comparative analysis of acne presentation in early-onset versus later-onset pediatric patients.

Main Results:

  • The typical age of onset for facial acne vulgaris has decreased, extending below 12 years of age.
  • Current epidemiologic data raise questions about the etiology of this earlier onset.
  • The influence of earlier puberty on acne clinical presentation requires further investigation.

Conclusions:

  • The demographic patterns of acne vulgaris are evolving, necessitating updated clinical understanding.
  • Further research is crucial to elucidate the causes behind the earlier onset of acne.
  • Investigating pathophysiologic differences in early-onset acne is essential for pediatric patient care.