September 2021 in “The journal of investigative dermatology/Journal of investigative dermatology” This study identified a germline variant in PLCD1 as a major risk allele for familial trichilemmal cysts, requiring a subsequent somatic mutation in the same allele for cyst formation.
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November 2007 in “Annals of Diagnostic Pathology” This report presents a case of a superficial angiomyxoma with a trichofolliculoma in a 51-year-old man, characterized by myxomatous nodules and specific immunohistological markers.
January 2022 in “Clinical Cases in Dermatology” This article describes pilar cysts, common dermal cysts often seen in young women, which typically require surgical removal.
January 2016 in “Japanese Journal of Oral & Maxillofacial Surgery” This case report documents a trichofolliculoma of the upper lip in a 70-year-old woman, highlighting its clinical presentation and successful surgical removal without recurrence.
July 2025 in “Clinical Dermatology Review” In this case report, researchers observed multiple trichofolliculomas in family members, noting this as a rare manifestation of typically singular hair follicle hamartomas.