A 51-year-old woman visited her doctor for a lesion that she first noticed on her scalp 3 years prior. Since then, slow growth was noted by the patient. On examination, there was a large firm, pink nodule with overlying diminished hair growth on the scalp. The patient had no personal history of dermatological disease but mentioned that her mother also had these types of scalp growths. The patient appeared well and had no recent history of trauma.
What’s the diagnosis?