page_title: List of skin conditions
section_title: Melanocytic nevi and neoplasms
hierarchical_section_title: List of skin conditions / Melanocytic nevi and neoplasms
caption_attribution_description: Becker's nevus / Becker-Naevus
context_page_description: Many conditions affect the human integumentary system—the organ system covering the entire surface of the body and composed of skin, hair, nails, and related muscle and glands. The major function of this system is as a barrier against the external environment. The skin weighs an average of four kilograms, covers an area of two square metres, and is made of three distinct layers: the epidermis, dermis, and subcutaneous tissue. The two main types of human skin are: glabrous skin, the hairless skin on the palms and soles, and hair-bearing skin. Within the latter type, the hairs occur in structures called pilosebaceous units, each with hair follicle, sebaceous gland, and associated arrector pili muscle. In the embryo, the epidermis, hair, and glands form from the ectoderm, which is chemically influenced by the underlying mesoderm that forms the dermis and subcutaneous tissues.
  The epidermis is the most superficial layer of skin, a squamous epithelium with several strata: the stratum corneum, stratum lucidum, stratum granulosum, stratum spinosum, and stratum basale. Nourishment is provided to these layers by diffusion from the dermis, since the epidermis is without direct blood supply.
context_section_description: Melanocytic nevi and neoplasms are caused by either a proliferation of (1) melanocytes, or (2) nevus cells, a form of melanocyte that lack dendritic processes.
  Acral nevus (melanocytic nevus of acral skin, melanocytic nevus with intraepidermal ascent of cells)
  Amelanotic blue nevus (hypomelanotic blue nevus) 
  Balloon cell nevus
  Bannayan–Riley–Ruvalcaba syndrome
  Becker's nevus (Becker's melanosis, Becker's pigmentary hamartoma, nevoid melanosis, pigmented hairy epidermal nevus)
  Benign melanocytic nevus (banal nevus, common acquired melanocytic nevus, mole, nevocellular nevus, nevocytic nevus)
  Blue nevus (blue neuronevus, dermal melanocytoma, nevus bleu)
  Blue nevus of Jadassohn–Tièche (common blue nevus, nevus ceruleus)
  Carney complex (LAMB syndrome, NAME syndrome)
  Cellular blue nevus
  Centrofacial lentiginosis
  Congenital melanocytic nevus
  Deep penetrating nevus
  Dysplastic nevus (atypical mole, atypical nevus, B-K mole, Clark's nevus, dysplastic melanocytic nevus, nevus with architectural disorder)
  Dysplastic nevus syndrome (B-K mole syndrome, familial atypical multiple mole–melanoma syndrome, familial melanoma syndrome)
  Ephelis (freckle)
  Epithelioid blue nevus
  Generalized lentiginosis
  Giant pigmented nevus (bathing trunk nevus, congenital nevomelanocytic nevus, garment nevus, giant hairy nevus, nevus pigmentosus et pilosus)
  Halo nevus (leukoderma acquisitum centrifugum, perinevoid vitiligo, Sutton nevus)
  Hori's nevus (acquired bilateral nevus of Ota-like macules)
  Inherited patterned lentiginosis in black persons
  Ink spot lentigo (sunburn lentigo)
  Laugier–Hunziker syndrome
  Lentigo simplex (simple lentigo)
  Malignant blue nevus
  Medium-sized congenital nevocytic nevus
  Melanoacanthoma
  Melanocytic tumors of uncertain malignant potential
  Moynahan syndrome
  Mucosal lentigines (labial and penile and vulvar melanosis, melanotic macules)
  Nevus of Ito (nevus fuscoceruleus acromiodeltoideus)
  Nevus of Ota (congenital melanosis bulbi, melanosis bulborum and aberrant dermal melanocytosis, nevus fuscoceruleus ophthalmomaxillaris, oculodermal melanocytosis, oculomucodermal melanocytosis)
  Nevus spilus (speckled lentiginous nevus, zosteriform lentiginous nevus)
  Partial unilateral lentiginosis (segmental lentiginosis)
  Peutz–Jeghers syndrome
  Pigmented spindle cell nevus (pigmented spindle cell tumor of Reed, pigmented variant of Spitz nevus)
  Pseudomelanoma (recurrent melanocytic nevus, recurrent nevus)
  PUVA lentigines
  Small-sized congenital nevocytic nevus
  Spitz nevus (benign juvenile melanoma, epithelioid and spindle cell nevus, Spitz's juvenile melanoma)
  Solar lentigo (lentigo senilis, liver spot, old age spot, senile freckle)
caption: Becker's nevus
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