One of the most dangerous types of skin cancer is melanoma, which begins to grow from pigment cells - melanocytes. These cells produce a pigment from which the usual birthmarks (Nevusi) are formed.
In most cases, melanoma is formed directly on the skin, sometimes on the mucous membranes. It can be quite small in size, but it is capable of rapidly spreading metastases through lymph and blood to any of the internal organs or at once in several.
Melanoma in numbers
On average, melanoma of the skin occurs in 1% of all cases of malignant neoplasms, but in recent years, its prevalence is increasing, affecting the most female representatives in the age group of 30-40 years.
Of all varieties of nevus, the most dangerous in terms of the development of melanoma is the so-called border nevus. It looks like a flat or slightly convex spot with clear boundaries of dark brown, dark gray or even black. The surface of such a nevus is not knotted, but smooth, and it does not grow hairs. Today, doctors prefer to remove such nevus, without waiting for them to rebound into a tumor.
It is believed that the following factors contribute to the transformation of the neuve into melanoma: