Pronunciation: [nˈɛvəs] (IPA) 
The word "nevus" is spelled with an "e" instead of an "a" because it comes from the Latin word "naevus". The Latin "ae" is pronounced as a long "e" in English, so the spelling was adapted to reflect this pronunciation. The IPA phonetic transcription of "nevus" is /ˈniːvəs/, with the stress on the first syllable. This word is commonly used in dermatology to refer to a type of skin lesion, sometimes referred to as a mole or birthmark.
Nevus, also known as a mole, is a benign growth on the skin characterized by a cluster of melanocytes, the pigment-producing cells of the body. This term is derived from the Latin word "naevus" meaning "birthmark." Nevi can occur anywhere on the body, including the face, scalp, extremities, and mucous membranes. These growths may vary in size, shape, and color, ranging from flat, broad marks to raised, dome-shaped lesions.
Nevi are typically classified into two major types: congenital (present at birth) or acquired (developed after birth). Congenital nevi are larger in size and have a higher risk of becoming malignant or cancerous compared to acquired nevi. Acquired nevi, which are more common, are usually smaller and less likely to undergo malignant transformations.
Some individuals may have numerous nevi scattered across their bodies, a condition called "nevus spilus" or "speckled lentiginous nevus." While most nevi are harmless and pose no health concerns, certain characteristics might indicate the need for medical attention, such as asymmetry, irregular borders, changes in size, color, or shape, or the presence of inflammation or bleeding.
Regular self-monitoring of nevi is essential, and any changes in shape, color, or size should be promptly reported to a dermatologist. In some cases, nevi may need to be biopsied or surgically removed for diagnostic purposes or if there are concerns about possible malignancy.
Naevus.
A practical medical dictionary. By Stedman, Thomas Lathrop. Published 1920.
The word nevus originates from Latin. It comes from the Latin word naevus, meaning birthmark or mole.
