Blue Nevi - Causes, Symptoms & Treatment
Blue nevus was first described as a variant of melanoma. It is a dark blue - black nevus covered by smooth skin and with minimal or without melanin pigmentation. Amelanotic cellular blue nevus is a cellular blue nevus. Blue nevi can also become cancerous when triggered by over exposure to UV rays. Like any other colored moles, these moles should be kept away from being exposed to the sunrays. The sun can damage the skin and could turn into melanoma. Blue nevi are solitary papules 2 mm to 1 cm in diameter or, less commonly, plaques, with a bluish color. Blue nevi are histologically similar to the Mongolian patch, commonly seen over the sacrum of Asian or African-American children. Blue rubber bleb nevus syndrome (BRBNS) is a rare disorder characterized by hemangiomas of the skin and gastrointestinal (GI) tract.
Dysplastic nevi can be found anywhere, but are most common on the trunk. Patients may have one, several, or dozens of dysplastic nevi at the same time. They often occur on sun-protected areas such as buttocks, breasts, and scalp. Although no minimum diameter is defined for dysplastic nevi, but they usually tend to be larger than common nevi, often greater than 5 mm in diameter. Blue nevi are most frequently noted in Asian populations, where the prevalence is estimated to be 3-5% in adults. They are found in 1-2% of white adults and are rarely found in blacks. Blue nevi are uncommon at birth or in the first few years of life, with an estimated prevalence of less than 1 case per 1000 population. Common and cellular blue nevi are not associated with chromosomal aberrations, and they show fewer B-RAF mutations compared with congenital and acquired nevi.
Causes of Blue Nevi
Common causes of Blue Nevi
Symptoms of Blue Nevi
Common Symptoms of Blue Nevi
Treatment of Blue Nevi
Common Treatment of Blue Nevi
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