Nevus

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 Authored by: Luc Thomas

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NailThis glossary term has not yet been described. matrix melanocyticThis glossary term has not yet been described. nevusThis glossary term has not yet been described.

Nail matrix melanocytic acquired neviThis glossary term has not yet been described. are dermoscopically characterized by their brown background coloration and the regular pattern of the longitudinal micro-linesstreaksThis glossary term has not yet been described.. Congenital neviis a type of melanocytic nevus (or mole) found in infants at birth. This type of birthmark occurs in an estimated 1% of infants worldwide; it is located in the area of the head and neck 15% of the time. may exhibit atypical patternsThis glossary term has not yet been described. and their differentiation from melanomaThis glossary term has not yet been described. is very difficultneeding much effort or skill to accomplish on the basis of clinical and dermoscopical features. Therefore careful follow-up is mandatory.

Nail unit lentigo or lentiginoses [1][2][3]

Lentigo and lentiginoses of various types (e.g. Laugier–Hutziker, Peutz–Jeghers or Carney complex) may affect the nailThis glossary term has not yet been described. unit. Examination of other involved areas and consideration that the nail pigmentation is polydactylic greatly aid in diagnosisis the identification of the nature and cause of a certain phenomenon. Diagnosis is used in many different disciplines with variations in the use of logic, analytics, and experience to determine "cause and effect". In systems engineering and computer science, it is typically used to determine the causes of symptoms, mitigations, and solutions. DermoscopyThe examination of [skin lesions] with a 'dermatoscope'. This traditionally consists of a magnifier (typically x10), a non-polarised light source, a transparent plate and a liquid medium between the instrument and the skin, and allows inspection of skin lesions unobstructed by skin surface reflections. Modern dermatoscopes dispense with the use of liquid medium and instead use polarised light to cancel out skin surface reflections. shows a gray band-like pigmentation (Fig. 3.49; see also Fig. 3.17). Follow-up of these patients might be difficult since additional longitudinal pigmented bands may occur over time.

Blue nevusis a type of melanocytic nevus that clinically and dermoscopically will appear blue of the nail unit

Blue nevus of the nail unit is also a very rare entity[4]. Dermoscopically, it corresponds to a blue proximal spot which is stable over time. In our view, the disease is rare enough to justify surgical exploration of the nail matrix and excision of the lesion.


ReferencesThis is material contained in a footnote or bibliography holding further information.
  1. Ronger S, Touzet S, Ligeron C et al. (2002) Dermoscopic examination of nail pigmentation. Arch Dermatol 138(10): 1327–33
  2. Sendagorta E, Feito M, Ramírez P, Gonzalez-Beato M, Saida T, Pizarro A. (2010) Dermoscopic findings and histological correlation of the acralPertaining to peripheral body parts, especially hands, feet, fingers, and toes. volar pigmented maculae in Laugier–Hunziker syndrome. J Dermatol 37(11): 980–4.
  3. Gencoglan G, Gerceker-Turk B, Kilinc-Karaarslan I, Akalin T, Ozdemir F. (2007) Dermoscopic findings in Laugier–Hunziker syndrome. Arch Dermatol 143(5): 631–3.
  4. Causeret AS, Skowron F, Viallard AM, Balme B, Thomas L. (2003) Subungual blue nevusis a type of melanocytic nevus that clinically and dermoscopically will appear blue. J Am Acad Dermatol 49(2): 310–12.