A Case of Giant Becker’s Nevus

A 16-year-old Turkish female patient was admitted to our clinic with the complaint of a brown lesion located unilaterally on the right side of the body. The lesion had appeared when she was between 3-4 years old. Dermatological examination showed a wide brownish patch with well defined and irregular borders that spreaded from right ankle to ipsilateral middle trunk (Figure 1). Total involvement surface area was estimated to be around 3700cm2. There was hypertrichosis on the lesion on the lumbar area, and acneiform papules on the thigh (Figure 2). Histopathologic examination of the lesion revealed moderate acanthosis, hyperpigmentation of the basal layer and hyperplasia of the arrector pili muscle (Figure 3). Based on the history, physical examination and histopathological findings of the lesion, the patient was diagnosed as BN. The results of routine laboratory tests such as complete blood count, liver function tests and renal function tests were within normal limits. No pathologic finding was detected in X-ray examination of the legs and abdominal ultrasonography.