LYCOS RETRIEVER 
Melanoma: Melanomas
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Melanoma with prominent pigment synthesis or animal-type melanoma (ATM) is a very rare type of melanoma. Its histogenesis has not been elucidated and ultrastructural features have not been described in human beings.
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Melanoma is primarily a malignancy of white individuals. African American persons develop melanoma approximately one twentieth as frequently as white persons, and the prevalence in Hispanic persons is approximately one sixth of that in white persons. However, mortality rates are higher in African Americans and Hispanics, who are more likely to have acral melanoma and advanced disease at presentation.
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Melanoma usually appears as an enlarging coloured skin spot. They can have various shades of brown, black and blue. They can be flat or raised. A small proportion of melanoma are not colourful, but appear as a changing "skin coloured" spot. Because of this, any changing skin spot should be reported to your doctor. Remember that the majority of melanoma have no symptoms when they are found.
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Melanoma is strongly associated with excessive exposure to ultraviolet radiation (UV), which can come from sunlight or tanning booths and beds. In the United States, the number of diagnosed cases of melanoma is increasing despite warnings about the harmful effects of the sun.
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Melanoma may be suspected by your doctor because of the history of change (if known) or the appearance of the skin lesion. The dermoscopic appearance is particularly helpful in the diagnosis of early melanoma, but in general only specialist dermatologists are trained in dermoscopy and dermoscopy is not necessary if the lesion has the typical clinical appearance of melanoma.
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Melanoma can occur on any skin or mucosal surface, although a history of cutaneous melanoma does not appear to increase the risk of developing primary intraocular or mucosal melanoma. Melanoma occurs most commonly on the trunk in white males and the lower legs and back in white females. In African American, Hispanic, and Asian persons, the most common site is the plantar foot, followed by subungual, palmar, and mucosal sites.
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