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The pathophysiology of acne.

Guy F Webster¹

¹Department of Dermatology, Jefferson Medical College, Thomas Jefferson University, Philadelphia, Pennsylvania, USA.

|September 17, 2005

Summary

Acne, an inflammatory skin condition, begins with abnormal shedding of skin cells, forming blockages. This creates an environment where Propionibacterium acnes bacteria can thrive, leading to inflammation.

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Area of Science:

Dermatology
Microbiology

Background:

Acne vulgaris is a common skin condition affecting pilosebaceous units.
It is characterized by inflammation and the formation of lesions like comedones.
Hormonal changes, particularly during puberty, play a significant role.

Purpose of the Study:

To elucidate the initial events and contributing factors in acne lesion development.
To understand the role of Propionibacterium acnes in the inflammatory process.

Main Methods:

The study describes the pathological cascade of acne formation.
It reviews the influence of keratinocyte desquamation and androgen stimulation.

Main Results:

Abnormal keratinocyte shedding leads to microcomedo formation.
Increased androgens stimulate sebum production, creating a favorable environment for Propionibacterium acnes.
Propionibacterium acnes proliferation triggers inflammatory responses and potential keratinocyte hyperproliferation.

Conclusions:

Acne development is initiated by abnormal follicular keratinization and exacerbated by bacterial activity.
Propionibacterium acnes is a key factor in perpetuating the inflammatory cycle of acne.

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