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    Glossary Gram-negative folliculitis

    bacterial infection of hair follicles resistant to certain antibiotics

    Gram-negative folliculitis is a bacterial infection of the hair follicles caused by Gram-negative bacteria, which are a group of bacteria that do not retain the crystal violet stain used in the Gram staining method of bacterial differentiation. This condition often occurs as a complication in individuals who have been on long-term antibiotic therapy for acne, leading to an overgrowth of these resistant bacteria. Symptoms include pustules and inflammation around hair follicles, typically on the face and neck.

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    1. Action of isotretinoin in acne rosacea and gram-negative folliculitis Journal of The American Academy of Dermatology · 1982 · 175 citations
    2. Isotretinoin treatment of acne and related disorders: An update Journal of The American Academy of Dermatology · 1983 · 126 citations
    3. Acneiform Dermatoses Dermatology · 1998 · 45 citations
    4. Top Ten List of Clinical Pearls in the Treatment of Acne Vulgaris Dermatologic Clinics · 2016 · 15 citations
    5. Bacteria Display Differential Growth and Adhesion Characteristics on Human Hair Shafts Frontiers in Microbiology · 2018 · 33 citations
    6. Scalp Bacterial Profile and Antibiotics Susceptibility Pattern in Patients With Primary Cicatricial Alopecia Annals of Dermatology · 2025
    7. Diagnostic delay, comorbid hidradenitis suppurativa and the prognostic value of bacterial culture in folliculitis decalvans: A cohort study JDDG Journal der Deutschen Dermatologischen Gesellschaft · 2023 · 7 citations
    8. Lichen simplex chronicus positive for C5b-9/MAC, IgD and C3c as a result of recurrent bacterial hair follicular unit infection Our Dermatology Online · 2020
    9. Immediate Post-Operative Folliculitis: A Foreign Body Reaction, Not an Infection International Society of Hair Restoration Surgery · 2025
    10. Ayurvedic Management of Folliculitis Decalvans AYUSHDHARA · 2025
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