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"Latar belakang : nevus melanositik didapat (NM) adalah salah satu kelainan pigmentasi melanositik yang dapat menjadi prekursor potensial melanoma. Telah diketahui bahwa tipe kulit putih merupakan salah satu faktor risiko terjadinya melanoma. Pola dermoskopi NM pada populasi kulit putih memiliki gambaran dermoskopik yang berbeda pada setiap tipe kulit (tipe I ? IV) menurut klasifikasi Fitzpatrick. Belum pernah dilaporkan perbedaan gambaran dermoskopik pada tipe kulit orang Indonesia yang umumnya berkulit sawo matang dengan tipe kulit IV dan V. Dianggap penting untuk mengetahui karakteristik gambaran klinis dan dermoskopik NM pada tipe kulit orang Indonesia yang meliputi tipe kulit III, IV dan V. Metode : penelitian ini menggunakan rancangan potong lintang, pada 96 subyek penelitian (SP) dewasa (usia 18-60 tahun) di Poliklinik IKKK RSCM Jakarta terbagi merata untuk setiap tipe kulit III, IV dan V. Dilakukan pemeriksaan gambaran klinis dan dermoskopik NM pada tiap SP. Gambaran klinis yang dinilai adalah morfologi klinis dan warna lesi. Hasil : didapatkan gambaran klinis NM yang paling banyak adalah lesi datar (88,44%), berwarna cokelat gelap (51,43%), dengan median ukuran 2 mm. Pola dermoskopik yang paling banyak ditemukan pada seluruh lesi NM adalah retikular (33,40%). Terdapat proporsi dan kecenderungan yang semakin meningkat pada pola retikular dengan meningkatnya kegelapan tipe kulit orang Indonesia (tipe kulit IV terhadap tipe kulit III OR 1,4 (95% CI 0,5-4,0); tipe kulit V terhadap tipe kulit III OR 1,7 (95% CI 0,6-4,8)). Kesimpulan : Tidak terdapat perbedaan gambaran klinis NM pada tiap tipe kulit orang Indonesia. Terdapat perbedaan pola dermoskopik pada tipe retikular dengan proporsi yang makin meningkat sesuai dengan tipe kulit yang makin gelap. ......Background : Acquired melanocytic nevi (MN) is one of melanocytic pigmentation disorder, which can be a potential precursor of melanoma. Fair skin type has been known as one of the risk factor for melanoma. The dermoscopic pattern of MN in white population is different among the skin types (type I ? IV) according to Fitzpatrick?s classification. The difference in dermoscopic pattern of MN among the skin types of Indonesian people, which commonly dark brown with types IV and V, has not been reported. It is important to know the clinical characteristics and dermoscopic pattern of MN in Indonesian people skin types, which includes the skin types of III, IV and V. Method : We performed a cross sectional study in 96 adult patients (18-60 years old), distributed equally for each skin type III, IV and V, at the Dermatovenereology outpatient clinic Dr Cipto Mangunkusumo hospital Jakarta. Each subject was examined for clinical and dermoscopic pattern. Clinical characteristic include clinical morfology and color. Result : The study found that the most frequent clinical characteristics of MN were planar lesion (88.44 %), dark brown color (53.43%), with median size 2 mm. The most frequent dermoscopic pattern in all MN lesions was reticular (33.40 %). There was increasing proportion and odds within reticular pattern with the increase of skin?s darkness of Indonesian people (skin type IV to type III with OR 1.4 (95% CI 0.5-4.0); skin type V to type III with OR 1.7 (95% CI 0.6-4.8), respectively). Conclusion : Clinical characteristics were not significantly different among the skin types of Indonesian people. There was difference on dermoscopic pattern within the reticular type, showing an increase of its proportion in accordance with the darker skin types."

"Nevus of Ota is a dermal melanocytic nevus which is characterized by benign hamartomatous hyperpigmentation.Clinically it presents as a congenital or acquired blue or gray patch on the face and is distributed on the ophthalmic,maxillary, and mandibular branches of the trigeminal nerve. It is most commonly found in Japanese populationsand is rare in the Indian subcontinent. It affects only 0.014 – 0.034% of the Asian population and is less commonin the male population, with a male to female ratio of 1.4:8. The involvement of pigmentation over the pinna of theear and the oral mucosa is extremely rare with very few cases reported in scientific literature. The case reportedhere is a case of nevus of Ota, with a rare intraoral presentation on the hard palate, crossing the midline."

"The “Abtropfung” theory that nevi develop through the migration of nevus cells from the epidermis to the dermis prevailed for almost a century until the “Hochsteigerung” theory postulated the reverse pattern of migration. Most recently, however, new insights gained from epidemiology, cross-sectional and longitudinal studies of nevi, dermoscopy and confocal microscopy, and cellular and molecular studies have brought into question both of these theories. This book provides a comprehensive guide to current knowledge about nevogenesis by presenting these latest advances and in addition discusses issues yet to be resolved. It will assist practicing physicians in effectively managing patients with a variety of nevi and will also be of great value to researchers in the field. Importantly, since nevi are associated with an increased risk of melanoma, understanding nevogenesis may help to unravel some of the mysteries of melanomagenesis."