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    Glossary Keratin-Filled Cysts

    Keratin-filled cysts, also known as epidermoid cysts or sebaceous cysts, are benign growths that occur when keratin, a protein found in hair, skin, and nails, becomes trapped beneath the skin. These cysts can appear on the scalp and may be relevant to hair loss as they can cause localized inflammation or irritation, potentially affecting hair follicles and leading to temporary hair thinning. Key distinguishing characteristics include their round shape, firm texture, and the presence of a central pore or opening, which may occasionally release a foul-smelling, yellowish substance when ruptured.

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    1. Eruptive Vellus Hair Cysts: Case Report and Review of the Literature Pediatric Dermatology · 1992 · 21 citations
    2. Vellus hair cysts presenting as an atypical acneiform eruption Anais Brasileiros de Dermatologia · 2011 · 6 citations
    3. Malignant appearance of trichilemmal cyst: a case report with review of the literature International surgery journal · 2023
    4. GWAS Identifies Three Susceptibility Loci for Trichilemmal Cysts 2021
    5. The clinical features and histopathologic patterns of folliculotropic mycosis fungoides in a series of 38 cases Journal of Cutaneous Pathology · 2014 · 46 citations
    6. Rippled‐pattern trichomatricoma Journal of Cutaneous Pathology · 1989 · 29 citations
    7. Atrichia and Papular Lesions: Report of a Case Dermatology · 1992 · 18 citations
    8. Congenital atrichia with papular lesions Indian Journal of Paediatric Dermatology · 2014 · 8 citations
    9. Congenital atrichia with papular lesions Dermatology Online Journal · 2020 · 4 citations
    10. Congenital milia En plaque on scalp Indian Journal of Dermatology · 2014 · 4 citations
    11. Hair follicle tumors in dogs: A report of two cases Indian Journal of Veterinary Pathology · 2015 · 1 citations
    12. A Newborn With Hair Loss Clinical pediatrics · 2013 · 1 citations
    13. Atrichia with papular lesions mimicking alopecia areata universalis Dermatology Online Journal · 2025
    14. Generalized multiple eruptive milia in an infant – An unusual presentation Indian journal of paediatric dermatology · 2022
    15. Papular atrichia International journal of research in dermatology · 2020
    16. Superficial angiomyxoma with trichofolliculoma Annals of Diagnostic Pathology · 2007 · 10 citations
    17. Trichofolliculoma with swelling of the upper lip and oral vestibule Japanese Journal of Oral & Maxillofacial Surgery · 2016
    18. Atrichia With Papular Lesions Archives of Dermatology · 1986 · 32 citations
    19. Atrichia with papular lesions resulting from a novel homozygous missense mutation in the hairless gene Clinical and Experimental Dermatology · 2003 · 20 citations
    20. Dilated pore of Winer in a dog Journal of comparative pathology · 2023
    21. Epidermoid Cyst of the Ear Lobule in Adult Kathmandu University medical journal · 2021 · 1 citations
    22. Umbilical keratinous cyst in a 7-year-old girl: A case report Indian journal of child health · 2024
    23. Iatrogenic epidermoid cyst in the parotid gland: A case report Journal of the Korean Association of Oral and Maxillofacial Surgeons · 2011 · 5 citations
    24. Comedones and epidermal cysts on the abdominal skin of a dog occurring after a laparotomy. PubMed · 2024
    25. 321 Deletion of hypoxia-inducible factor prolyl 4-hydroxylase 2 in FoxD1-lineage mesenchymal cells leads to congenital truncal alopecia 2021 · 1 citations
    26. Rare Diagnosis of a Proliferating Pilar Tumor in a Facial Hairline Cryst Folia Medica Indonesiana · 2022
    27. A 43-Year-Old Woman with a Solitary, Asymptomatic Nodule on the Scalp Clinical Cases in Dermatology · 2022
    28. 이하선에서 발견된 유표피낭 대한구강악안면외과학회지 · 2011 · 1 citations
    29. Epidermoid Cyst in the Bitch Mammary Gland ACTA SCIENTIAE VETERINARIAE · 2024
    30. A Rare Presentation of a Pilar (Trichilemmal) Cyst of the Upper Arm in an Elderly Male Cureus · 2026