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Squamous cell carcinoma (or squamous cell carcinoma) develops in the middle layers of the epidermis and accounts for 20% of all cases of skin cancer.

Usually occurs in areas that have been exposed to the sun, like the top of the nose, ears, forehead, upper lip and backs of hands. You can also occur in areas of skin that have been in contact with chemicals that have undergone radiotherapy, or have been burned. In the genital area, appears less frequently. Usually occurs usually a red bump and drive. Sometimes it may look, scaly, or bleed and develop a scab that never heals. As you have enlarged nodular and sometimes presents a warty surface. In the end, it becomes an

open sore and growing into the underlying tissue. Through the lymph system can extend to any body part, but this happens rarely. It is a tumor with a tendency to grow and be on the same site, once removed. But it tends to spread. Basal cell carcinoma is the most common type of nonmelanoma skin cancer. About 75% of all skin cancers are basal cell carcinomas. Subsequent to the bottom layer of the epidermis, consisting of basal cells. And usually occurs in areas that have been exposed to the sun, like the head and neck. It grows slowly and rarely spreads to other parts of the body so it is less aggressive than squamous cell carcinoma. Although not for that we must stop treating it as if nothing is done, over time, will spread to surrounding tissues. It looks like this is a minor bump with a smooth and shiny appearance. But it can be shaped scar, still firm to the touch. Usually develops slowly although the rate varies from one to another. It is not uncommon to reappear once the person has been treated. 35% to 50% of those diagnosed will develop a new skin cancer within five years from first diagnosis. Other less common types: + Kaposi's sarcoma: originates in the dermis but can also occur in internal organs. Kaposi's sarcoma in two forms: The one that usually develops in people infected with the acquired immunodeficiency syndrome (AIDS) and children and young people of equatorial Africa. This is growing very fast and usually affects the internal organs. Before the onset of the disease, tended to present only the elderly of European origin Mediterranean. In these people grows very slowly on the skin and rarely spreads. In the first the characteristic appearance is a sin pink, red or purple, round or oval shape, anywhere in the body but more often in the face. In the latter usually appears as a purplish stain or dark brown on the legs or toes. Usually increase their depth causing a bleeding ulcer. You can also spread up the leg. + Cutaneous lymphoma, occurs when skin cells (cells of the immune system or defense) become malignant. The dermis contains a considerable number of lymphocytes. The most common of these is the cutaneous T-cell lymphoma or mycosis fungoides. It develops over many years, very slowly. In the initial stages, you may notice itchy skin and dark areas and provide dry. When the disease has developed is called mycosis fungoides. This disease can spread through the lymphatics to other organs such as lung, liver, etc.. The sooner the diagnosis is made, the greater the likelihood of cure. + Melanoma skin cancer This disease develops in the melanocytes, skin cells that produce the melanin that gives color. Melanocytes are found in the epidermis layer of outer skin. Melanoma is the type of skin cancer less common and more serious. You can easily spread to other parts of the body through blood or lymphatic system. If diagnosed early, the prognosis is better. It can occur from existing moles, or a newly formed, small, pigmented, appearing in an area of normal skin. We will have to consult the doctor whenever it is noticed a change in the size, shape or color of a mole. Or a mole that is swollen or sore to the touch or oozing or bleeding. Generally, in men usually appear on the trunk and in women, is more common in the lower legs. They tend to have clear skin. Can occur in people with darker skin, in areas of the hands, soles of the feet and under nails. In some rare cases, melanoma can appear in other tissues than skin, such as the bowel or into the eye. Melanoma accounts for 4% of all skin cancers. But due to malignancy, is responsible for approximately 79% of deaths from skin cancer. The number of people affected by this type of cancer has increased in recent years. Spain has increased more than three males and just over two women, in the last twenty years. In the U.S., the number of cases has doubled since 1973 and killed approximately 6,000 people year.