Umbilical Keratinous Cyst in a 7-Year-Old Girl: A Case Report

A 7-year-old girl presented with a painless, small tumor originating from her umbilicus, which had been slowly growing for several years. The tumor, a 3-cm-long skin tag with three interconnected tumors, appeared to contain whitish material inside. After resection through a sub-umbilical skin incision, histology reports identified the tumors as superficial keratinous cysts, a common type of benign skin lesion filled with keratin, often from the hair follicle. Despite their commonality, they are not the most common lesions at the umbilicus. This case highlights the need for clinicians to consider such pathology when evaluating umbilical swellings and tumors, especially in children.