Adult or coetaneous trichodermoma is a term used in dermatology to describe a rare benign skin tumor that typically develops in adulthood, specifically during middle age. A trichodermoma is a subtype of dermal neoplasm that arises from the hair follicles and sebaceous glands in the skin. These tumors are usually solitary and slow-growing, presenting as well-defined, firm, and flesh-colored or slightly pigmented nodules.
The adult or coetaneous trichodermoma primarily affects the face, especially the nasolabial folds, cheek, and forehead. However, cases of occurrence on other parts of the body, such as the scalp, trunk, and extremities, have also been reported. These tumors are typically painless and do not cause any discomfort unless they become large enough to cause mechanical effects, such as localized pressure or obstruction.
Histopathological examination is necessary for an accurate diagnosis, which reveals characteristic features such as basaloid islands, pale epithelial cells, compressed fibrous stroma, and occasional multinucleated cells. Immunohistochemical staining techniques, such as cytokeratin and epithelial membrane antigen markers, may be used to confirm the diagnosis.
Although adult trichodermoma is considered a benign lesion, surgical excision is generally recommended due to the risk of misdiagnosis and the potential for a rare malignant transformation. Wide local excision or Mohs micrographic surgery is often employed to ensure complete removal and reduce the chances of recurrence. Regular follow-ups are advisable to monitor any potential changes or recurrence of the lesion.
