What is a congenital melanocytic naevus? A congenital melanocytic naevus (American spelling nevus) is a proliferation of benign melanocytes that are present at birth or develop shortly after birth. This form of a congenital naevus is also known as a brown birthmark.

Feb 14, 2013 · Congenital melanocytic nevi (CMN) are visible pigmented (melanocytic) proliferations in the skin that are present at birth. CMN are benign, tumor-like malformations resulting from faulty development of pigment cell (melanocyte) precursors in the embryo, and composed of an abnormal mixture of skin elements.

Jun 18, 2024 · Congenital melanocytic nevi are brown or sometimes blackish papules (small, solid bumps) or patches (flat areas larger than a thumbnail) that are present at birth or shortly after (before age 1 year). They may have a smooth, round border, or the border may be irregular.

The congenital melanocytic nevus is a type of melanocytic nevus (or mole) found in infants at birth. This type of birthmark occurs in an estimated 1% of infants worldwide; it is located in the area of the head and neck 15% of the time. Congenital nevus. Note the variable coloration and slightly irregular border.

View Dermatology & Laser Surgery Center's small congenital melanocytic nevi before and after gallery. We proudly serve patients in the Houston, TX area.

Dec 2, 2024 · Congenital melanocytic nevus (CMN) is a benign skin lesion typically present at birth, characterized by nests of melanocytes that may extend into the dermis and, in some cases, deeper structures such as muscle or the central nervous system.

Symptoms of CMN include the presence of moles on the skin from birth or that appear in the first few months of life. These birthmarks range in color from light brown to black. They may darken, get thicker or grow hair as your child ages.

Jun 29, 2017 · Ideally, the photographs of CMN should include overview clinical images and dermoscopic images (Nehal et al., 2002b). The dermoscopic images should capture the representative architecture and border of the CMN (Braun et al., 2001).

Download scientific diagram | Clinical images of children with congenital melanocytic nevi (CMN). Examples of (ai–v) red-haired children with CMN, and (b) different cutaneous phenotypes of CMN.

Congenital Melanocytic Nevi (CMN), on the other hand, are made up of pigment-producing cells called nevomelanocytes. These cells are not evenly distributed. When many nevomelanocytes are clumped together, they can result in moles on the skin because of the higher concentration of melanin (pigment).