The term<unk>  is applied to a number of conditions caused by neoplasias and hyperplasias of melanocytes, as well as a number of pigmentation disorders, both hypermelanotic (containing increased melanin, the pigment responsible for skin color) and hypomelanotic (containing decreased melanin). Suspicious skin moles which are multi-colored or pink may be a finding in skin cancer. Increased melanin Usually acquired * Melanocytic<unk>  * Melanocytic nevi can be categorized based on the location of melanocytic cells * Junctional: epidermis * Intradermal: dermis * Compound: epidermis and dermis * Atypical (dysplastic)<unk> : This type of<unk>  must be diagnosed based on histological features. Clinically, atypical nevi are characterized by variable pigmentation and irregular borders. * Becker's<unk>  * Blue<unk>  (rarely congenital): A classic blue<unk>  is usually smaller than 1 cm, flat, and blue-black in color. * Hori's<unk>  *<unk>  spilus (speckled lentiginous<unk> : This lesion includes dark speckles within a tan-brown background. * Pigmented spindle cell<unk>  * Spitz<unk>  * Zosteriform lentiginous<unk>  Usually congenital * Congenital melanocytic<unk>  * These nevi are often categorized based on size, however, the lesions usually grow in proportion to the body over time, so the category may change over an individual's life. This categorization is important because large congenital melanocytic nevi are associated with an increased risk of melanoma, a serious type of skin cancer. * Small: File:Conjunctival<unk> .Conjunctival<unk>  of a 32-year-old male File:Micrograph of an intradermal melanocytic<unk> .Micrograph of an intradermal melanocytic<unk>  File:Normal mole (1).Acquired melanocytic nevi File:Dysplastic nevi (4).Atypical<unk>  File:Becker's<unk>  of shoulder.Becker's<unk>  File:Blue<unk> .Blue<unk>  File:Naevus-spilus.Nevus spilus File:Spitz<unk> .Spitz<unk>  File:Congenital<unk>  from CDC.Congenital melanocytic<unk>  File:Nevus of Ota Before IBRITE C.Nevus of Ota File:Compound<unk>  left buttock.Compound<unk> , left buttock Decreased melanin Acquired *<unk>  anemicus Congenital *<unk>  depigmentosus File:Nevus anemicus.Nevus anemicus File:Nevus Depigmentosus.Nevus depigmentosus Additional types of nevi do not involve disorders of pigmentation or melanocytes. These additional nevi represent hamartomatous proliferations of the epithelium, connective tissue, and vascular malformations. Epidermal nevi These nevi represent excess growth of specific cells types found in the skin, including those that make up oil and sweat glands. * Verrucous epidermal<unk>  *<unk>  sebaceous *<unk>  comedonicus * Eccrine<unk>  * Apocrine<unk>  Connective tissue nevi Connective tissue nevi represent abnormalities of collagen in the dermis, the deep layer of the skin. * Collagenoma * Elastoma Vascular nevi These nevi represent excess growth of blood vessels, including capillaries. *<unk>  simplex<unk>  flammeus nuchae), also known as a stork bite or salmon patch. File:NaevusSebaceus res.Nevus sebaceous File:Nevus flammeus nuchae ("stork bite" "Storchenbiss").Nevus flammeus nuchae Intramucosal nevi An intramucosal<unk>  is a<unk>  within the mucosa as found in for example the mouth and genital areas. In the mouth, they are found most frequently on the hard palate. They are typically light brown and dome-shaped. Intramucosal nevi account for 64% of all reported case of oral nevi.
Nevus
Acanthoma
Papilloma
Xanthoma
Blue nevus
Skin tag
Epulis
Acral nevus