More Than Skin Deep: A Case of Nevus Sebaceous Associated With Basal Cell Carcinoma Transformation

Nevus sebaceous is a congenital epidermal lesion that typically presents in infancy from the neck up and rarely undergoes malignant transformation. In patients who do present with malignancy, both RAS oncogene and PTCH tumor suppressor gene mutations have been implicated. We report an unusual case of nevus sebaceous in a 41-year-old male patient that developed into basal cell carcinoma on the forehead, and elaborate on the prolonged nature and unique location of its presentation. The case highlights the need for early intervention and how variable access to primary care can impact patient outcomes. We further explore the role of gene mutations in the circumstance that nevus sebaceous does become malignant, as well as pertinent differential diagnoses to consider.