Cancer

Melanoma

Less common than other types, melanoma is by far the most dangerous, causing about 75 percent of all skin cancer-related deaths (American Melanoma Foundation, 2009). It occurs in the skin cells that create pigment, and it creates moles or lesions that follow an ABCDE pattern in their irregularities:

asymmetrical shape
border irregularities
color
diameter
evolution of the lesion

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http://en.wikipedia.org/wiki/Melanoma

Squamous Cell Carcinoma

Squamous cell carcinoma affects cells in the middle layer of the epidermis. It is typically more aggressive than basal cell carcinoma. It appears as red, scaly, and rough skin lesions, typically on sun-exposed areas such as the hands, head, neck, lips, and ears. Similar red patches may be squamous cell carcinoma in situ (Bowen’s disease), the earliest form of squamous cell cancer.

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http://en.wikipedia.org/wiki/Squamous-cell_carcinoma

Types of Skin Cancer-Skin Cancer

Skin cancer is the most common cancer in the United States, affecting one in five Americans during their lifetimes, according to the Skin Cancer Foundation.

Skin cancer is the uncontrolled growth of cancer cells in the skin. Left untreated, these cells can spread to other organs and tissues, such as lymph nodes and bone.

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http://en.wikipedia.org/wiki/Skin_cancer