What is the definition or description of: skin cancer?

Abnormal growth : Skin cancer is an abnormal growing of skin cells. The three main types of skin cancers are based upon there cell of origin. Squamous cell cancers are from the superficial layer, basal cell cancers from a little bit deeper layer and lastly melanoma is from the pigment in the skin. Any new growth or changing area on the skin should be checked out by your doctor.

Any skin structure: Skin is the largest and one of the most complex organs in the body composed of hundreds of different structures. Nearly any of these elements can degenerate into cancer. However the three most common are: basal cell, squamous cell and melanoma which occur in that order and degree of aggressiveness. Although heredity plays a major role, sun exposure and tobacco use & occupational exposure are risks.

Unregulated growth: Cancer by definition is the growth in size and number in an unregulated manner of a cell line that has developed a mutation. The mutation is passed through the offspring which accumulate more and more mutations. The defining factor is that the cells act immortal as compared to normal cells that have a programmed lifespan. In the skin this can occur in the cells in different layers of the skin.