Nevus sebaceous on the scalp: question

Abstract

A 1-month-old, full-term male infant received a neonatology consultation because of a localized, well-delimited, waxy alopecic area on his scalp that had been present since birth. Apart from the scalp lesion, a physical examination and neurological and ophthalmological observations revealed no abnormalities. The patient had a non-pathological medical history, and his development was appropriate for his age. He was born to a healthy mother via caesarian delivery, and his birth weight was 3,330 g. The infant had no family history of similar skin lesions or known genetic disorders.

1. What is your diagnosis?
2. How should you follow up this case?
3. When should you worry about this lesion and refer the patient to other specialists?