More advanced imaging tests are available for distinguishing melanocytic nevi from melanoma, including computerized dermoscopy and image analysis. Nevi are typically diagnosed clinically with the naked eye or using dermatoscopy. Diagnosis Various differential diagnoses of pigmented skin lesions, by relative rates for biopsied lesions, and malignancy potential, including "nevus" at left and top. Intramucosal nevi account for 64% of all reported case of oral nevi. They are typically light brown and dome-shaped. In the mouth, they are found most frequently on the hard palate. Īn intramucosal nevus is a nevus within the mucosa as found in for example the mouth and genital areas. This categorization is important because large congenital melanocytic nevi are associated with an increased risk of melanoma, a serious type of skin cancer. These nevi are often categorized based on size, however, the lesions usually grow in proportion to the body over time, so the category may change over an individual's life.Nevus spilus (speckled lentiginous nevus): This lesion includes dark speckles within a tan-brown background.Blue nevus (rarely congenital): A classic blue nevus is usually smaller than 1 cm, flat, and blue-black in color.Clinically, atypical nevi are characterized by variable pigmentation and irregular borders. Atypical (dysplastic) nevus: This type of nevus must be diagnosed based on histological features.Melanocytic nevi can be categorized based on the location of melanocytic cells.Suspicious skin moles which are multi-colored or pink may be a finding in skin cancer. The term nevus is applied to a number of conditions caused by neoplasias and hyperplasias of melanocytes, as well as a number of pigmentation disorders, both hypermelanotic (containing increased melanin, the pigment responsible for skin color) and hypomelanotic (containing decreased melanin).
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