The birthmark (the nevus or a birthmark) is congenital defect of a skin, is so and the got, good-quality educations having the virus nature. Birthmarks are formed as a result of overflow of cells of a skin by a pigment and their transformation to melanocytes.
Pigmental nevus is available for all people who are senior 10 years. More often they are located on the person at the rate on each 1000 square millimeters of a surface of an integument.
At newborns a punctual nevus meets very seldom, they start to be shown already in the first years of life of the kid. In large quantities a nevus starts to appear at teenage age in puberty, thanks to influence of hormones. Hardly appreciable specks are enlarged in size, change in coloring, up to dark brown and black.
Melanin formation in integument cells very strongly is influenced by a pituitary body hormone. At pregnant women a new nevus appears more often, than at other people, already available birthmarks change coloring and change in size.
Birthmarks can settle down on any part of a body of the person including on a mucosa of a mouth and an eye, in tongue, in a vagina and in a proctal aperture. According to doctors a nevus on mucous at women meets more often, than at men.
The wart is an eminence of a skin, the roundish form which appears in a consequence of growth of a blanket of an epithelium and a so-called, papillary layer of a skin which is under it. The sizes of warts happen different from 2 to 15 mm and more; as a result of merge of several warts occur big enough tumors having pencil-point, and more often to a floor the ball-shaped form. In due course color of warts which initially has skin color, becomes gray and even black, substantially, occurs thanks to a mud which easily sticks to a rough surface of warts.
Distinguish three kinds of warts: an ordinary or youthful wart, a senile and peaked wart.
The ordinary or youthful wart appears more often on a skin of arms and feet and sometimes on face.
These warts can stay on a skin for a long time, weeks and even for years, without causing unpleasant sensations, excluding only those cases when they take place on fingers of arms or on soles then they can be painful as are exposed to influence from the outside.
So-called, senile warts settle down on a breast or on a back more often. There are they at people after forty years. Men to it are subjected more often than women. The surface of this kind to the touch is a little fat and at careless scratching, there is a punctual bleeding.
Warts can be infectious; however the period from infection before its occurrence on a skin is great enough — about eight months. Cases are known that the wart disappeared itself. One of ways of disposal of warts is internal treatment by arsenic. External freezing of a wart by nitric acid or cauterization by 10 %-s’ solution of milk and salicylic acids in a collodion is also successfully applied.
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