Beauty and Style → What kind of moles are dangerous

Birthmarks, moles — different types of congenital skin changes in a limited area of skin. There are no vascular moles — in the form of light or dark skin pigmentation, or in the form of warty or pedicellate elevations of the skin, and vascular, so-called Angiomas.
Birthmark, nevus (naevus maternus), congenital malformation of the skin, in which individual parts differ in colour and / or a special kind of warty surface. Moles do not have a definite location. They can be visible at birth in the first years of life or later.

Vascular birthmarks (hemangiomas) are characterized by different values, jagged edges, pink or bluish-red, blanch with pressure, they are flat, superficial (capillary birthmarks) or knotted inherent in the thickness of the skin, with a bumpy, cavernous surface (cavernous moles).

Acrochordus birthmarks occur in single or multiple patches of various forms of dirty gray or brown with a rough keratotic surface.
Pigmented birthmarks — from light brown to almost black — are the size of a pinhead to occupy large areas of skin plaques. The surface may be rough, hairy (hairy-pigmented birthmarks).
An integral concept of nevus — congenital anomaly, which characterized by the appearance on the skin, mucous membranes or retina of the eye, spots or growths, made up of clusters of melanocytes varying degrees of differentiation. Nevi occur most frequently after birth or during the first years of life. Sometimes nevi may occur in young and in middle age under the influence of solar radiation, or during pregnancy.
The name «birthmarks» not entirely accurate, since many of them are acquired. Almost everyone has a certain amount of moles, which usually appear in childhood and adolescence. At puberty and during pregnancy may be new moles, and existing sometimes increase or darken. Approximately 40-50% of malignant melanomas develop from melanocytes moles (the others — from other parts of the skin melanocytes) children have these tumors very rare and come from large pigmented nevi, existing from birth.
What kind of birthmarks are:

Lentigos (border) — this is uniformly flat pigmented spot on the dark-brown to black, which result from increasing the number of melanocytes at the border of the epidermis and dermis (layers of skin). Compared with freckles lentigos are darker and are rarely, in addition, their color is not amplified and the number does not increase under the action of sunlight.
Epidermis-dermal nevi — usually flat, but sometimes rise above the level of the skin. The colour varies from light brown to almost black, sizes — from 1 to 10 mm in diameter. Arise as a result of accumulation of melanocytes at the border between the epidermis and dermis. Birthmark on the palms, soles and in the genital area are usually epidermo-dermal.

Compound nevi — often are dark and in varying degrees rise above the level of the skin. Clusters of melanocytes are localized (are) both on the border between the epidermis and dermis, and in the dermis.
Intradermal nevi are raised above the skin, their colour ranging from flesh to black, and the surface may be smooth, hairy or warty.
Sutton's Nevus — pigmented birthmarks (usually complex and intradermal nevi), surrounded by a ring of depigmented (unpainted) skin.Sutton's nevi disappear spontaneously, and only in rare cases give rise to malignant melanoma.

Dysplastic nevi — a pigmented spots of irregular shape and with indistinct borders, slightly above the level of the skin, the color of their range from reddish-brown to dark brown on a pink background. Dysplastic nevi first attracted attention by their unusual appearance and increased frequency in certain families (inherited). Typically, they are larger than ordinary moles, reaching 5-12 mm in diameter; localization also different: dysplastic nevi, although it can occur anywhere, most occur in areas normally covered with clothes (on the buttocks, breasts) or on the scalp of the head. Most people have an average of 10 ordinary moles, whereas dysplastic nevus can be greater than 100. Common nevi usually appear during the onset of maturity, dysplastic are continuing to occur even after 35 years.

Blue nevi — elevated above the skin, sometimes hemispherical formation of dense, usually with a smooth surface, light blue, dark blue, sometimes brown, with a clear boundary, with values from 0,5 to 2,0 cm, without hair. The preferred localization is the face, limbs, buttocks.

Cellular blue nevus — biologically more active and different from the simple blue nevus pronounced proliferation of melanocytes. The latter feature increases the risk of developing melanoma.
Giant pigmented nevi — is most often congenital and increases as the child grows. These nevi have a flat surface papillary and can occupy large areas of the skin of the trunk, limbs, face. The predominant colour — brown, gray, black.