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Primary scarring alopecias.

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    Scarring alopecia involves permanent hair loss due to follicle destruction and scarring. It is classified by the primary site of inflammation, such as lymphocytic or neutrophilic, affecting hair follicles or surrounding skin.

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    Area of Science:

    • Dermatology
    • Pathology

    Background:

    • Scarring alopecia, also known as cicatricial alopecia, results from irreversible follicular damage and replacement by scar tissue.
    • It is categorized into primary scarring alopecias, which directly impact hair follicles, and secondary scarring alopecias, where dermal damage leads to secondary follicular destruction.

    Purpose of the Study:

    • To differentiate between primary and secondary scarring alopecias.
    • To classify scarring alopecias based on the predominant inflammatory infiltrate (lymphocytic or neutrophilic).

    Main Methods:

    • Review of existing literature and classification of scarring alopecia subtypes.
    • Analysis of inflammatory patterns associated with different cicatricial alopecia conditions.

    Main Results:

    • Primary scarring alopecias primarily affect the hair follicle.
    • Lymphocytic inflammation characterizes conditions like discoid lupus erythematosus and lichen planopilaris.
    • Neutrophilic inflammation is observed in folliculitis decalvans and dissecting cellulitis; folliculitis keloidalis presents a mixed infiltrate.

    Conclusions:

    • Understanding the inflammatory basis is crucial for diagnosing and managing scarring alopecia.
    • Classification based on inflammation aids in differentiating various cicatricial alopecia subtypes.