[Sebaceous hamartoma on the face: about a case]

Sebaceous naevus (sebaceous hamartoma) is a congenital lesion mainly localized to the scalp, whose clinical and histologic diagnosis is generally easy. In the vast majority of cases, it is diagnosed at birth, but it can sometimes go unnoticed and give the impression to occur later. This lesion may be complicated by benign tumors or more rare malignancies. We report the case of a 45-year old patient, who had been followed-up for Biermer's anemia (treated with monthly HYDROXOCOBALAMINE injection) and ophiasic alopecia for 15 years, presenting with a 10-year history of bilateral and symmetric pigmented plaques gradually increasing in size. Clinical examination showed temporal and subauricular plaques, with brownish verrucous appearance and smooth surface (A, B). Histological examination objectified acanthosis, papillomatosis and voluminous sebaceous glands located abnormally high within the dermis, suggesting sebaceous hamartoma. CO₂ laser treatment was proposed to the patient.