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This is the most dangerous form of skin cancer. This type of cancer develops when ultraviolet radiation damages the skin's DNA and  triggers mutations. This causes the cells to multiply rapidly and cause malignant tumors. This specific type of skin cancer is the most common type of melanoma.

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Metastases are diseases produced by malignant or cancerous cells.

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Malignant tumors invade surrounding tissues, they produce metastases and may recur after removal. Very likely to cause death unless treated.

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Irregular moles, also called dysplastic nevus (25% of cases arise from this)

Moles that begin to spread into surrounding tissue

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From 2012 to 2017, there has been a 95% survival rate and this rate has been rising.

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Doctors may use a dermatoscope which will identify key distinguishing features of the mole.

Biopsies of the skin lesion may also be taken so it may be closely examined under a microscope.

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Irregularly shaped and colored. They are generally larger than most moles, 1 to 2 cm in diameter at diagnosis. Possible colors are brown, dark brow, black, blue, grey, pink, and red.

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This accounts for 70% of all melanoma cases

More often seen in young people

Males and females are equally susceptible to this

Only 15% of melanomas arise before age 40

Less than 1% arise under the age of 20

Happens most often in sites of intense sun exposure (40% in trunk of males, 40% in legs of females)

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Increasing age

Previous cases of invasive melanoma

Previous cases of nonmelanoma skin cancer

Large amount of moles

Strong family history of meanoma

Fair skin that burns easily

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https://www.skinvision.com/library/superficial-spreading-melanoma
https://www.dermnetnz.org/topics/superficial-spreading-melanoma/
http://www.skincancer.org/skin-cancer-information/melanoma/types-of-melanoma
https://www.mayoclinic.org/diseases-conditions/melanoma/symptoms-causes/syc-20374884
http://sciencenetlinks.com/interactives/skindeep/interactive/index.html
https://www.healthline.com/health/superficial-spreading-melanoma

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Treatments vary depending of the severity and stage

Early stages increase survival rate and the treatment will often be excision (the removal of the skin and the surrounding area)

Later stages will require radiotherapy, or further surgery of metastasized lymph nodes.