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In this case report, a 7-year-old girl developed a painless, slowly growing keratinous cyst at her umbilicus, which was successfully resected and identified as a benign skin lesion; the authors emphasized the importance for clinicians to consider this diagnosis in pediatric umbilical tumors.

This study describes two new types of dermal keratinous cysts of the eyelids, derived from the pilosebaceous apparatus, each presenting distinct management challenges.

This case report describes a proliferating trichilemmal cyst that underwent malignant transformation, with specific keratins identified in the tumor but no epidermal keratin detected.

This study suggests that the keratins found in reptile and bird skin appendages evolved independently from mammalian hair keratins, highlighting convergent evolution in these species.

This study suggests that eruptive vellus hair cysts often have atypical pathological changes and likely originate from the infrainfundibulum and sebaceous duct based on keratin expression analysis.