Skin Cancer Causes Ultraviolet Symptoms Treatment Surgery Medicines
Skin tumors are growths of the skin with different causes and different degrees of malignancy. The three types of cancer most common malignant skin carcinoma basal cell, squamous cell carcinoma and melanoma, each named after the type of skin cell from which it came.
Skin cancer is the most common of all human cancers. Some form of skin cancer is diagnosed in more than 1 million people in the United States each year. Cancer occurs when normal cells undergo a transformation during which they grow and multiply without normal controls. As the cells multiply, they form a mass called a tumor. Tumors of the skin are often referred to as lesions. Tumors are cancerous only if they are malignant. This means that they encroach on and invade neighboring tissues because of their uncontrolled growth. Tumors may also travel to remote organs via the bloodstream or lymphatic system. Tumors overwhelm surrounding tissues by invading their space and taking the oxygen and nutrients they need to survive and function. Skin cancers are of three major types: basal cell carcinoma (BCC), squalors cell carcinoma (SCC), and melanoma. The vast majority of skin cancers are BCCs or SCCs. While malignant, these are unlikely to spread to other parts of the body. Malignant melanoma is a highly aggressive cancer that tends to spread to other parts of the body. These cancers may be fatal if not treated early. Like many cancers, skin cancers start as precancerous lesions. A nevus is a mole, and dysplastic nevi are abnormal moles. These can develop into melanoma over time. Moles (nevi) are simply growths on the skin. They are very common. Very few moles become cancer. Most people have 10-40 moles on their body. Moles can be flat or raised; some begin as flat and become raised over time. The surface is usually smooth. Moles are round or oval and no larger than ¼-inch across. Moles are usually pink, tan, brown, or the same color as the skin. Other colors are sometimes noted. An individual's moles usually look pretty much alike. Dysplastic nevi are not cancer, but they can become cancer. People with dysplastic nevi often have a lot of them, perhaps as many as 100 or more. People with many dysplastic nevi are more likely to develop melanoma, either within an existing nevus or on an area of normal skin. Dysplastic nevi are usually irregular in shape, with notched or fading borders. Dysplastic nevi may be flat or raised, and the surface may be smooth or rough ("pebbly").Dysplastic nevi are often large, ¼-inch across or even larger. Dysplastic nevi are typically of mixed color, including pink, red, tan, and brown.
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