黑點--it is usually a mole.黑痣/胎塊。
see picture http://en.wikipedia. org/wiki/Melanoma
Melanoma is a malignant tumor of melanocytes and, less frequently, of retinal pigment epithelial cells (of the eye, see uveal melanoma). While it represents one of the rarer forms of skin cancer, melanoma underlies the majority of skin cancer-related deaths.
Despite many years of intensive laboratory and clinical research, the sole effective cure is surgical resection of the primary tumor before it achieves a thickness of greater than 1 mm. Stage IV Metastatic forms of the disease, where cells from the primary have moved to distant parts of the body and proliferated, are extremely dangerous and patient survival rarely exceeds two years.
Melanoma of the skin accounts for 160,000 new cases worldwide each year, and is more frequent in white men. It is particularly common in white populations living in sunny climates. According to the WHO Report about 48,000 deaths worldwide due to malignant melanoma are registered annually.
The diagnosis of melanoma requires experience, as early stages may look identical to harmless moles or not have any color at all. Moles that are irregular in color or shape are suspicious of a malignant melanoma or a premalignant lesion.
The treatment includes surgical removal of the tumor; adjuvant treatment; chemo- and immunotherapy, or radiation therapy.
· 1 decade ago