Benign melanocytic nevus

Normal mole with no color differences

Benign melanocytic nevus

A benign melanocytic nevus (plural: nevi) is a type of skin lesion that is typically non-cancerous. These lesions are commonly referred to as moles and are composed of melanocytes, the cells responsible for producing melanin, the pigment that gives skin its color.

Classification

Benign melanocytic nevi can be classified into several types based on their appearance and location within the skin layers:

• Junctional nevi: These are located at the junction of the epidermis and dermis.
• Compound nevi: These involve both the epidermis and dermis.
• Intradermal nevi: These are located entirely within the dermis.

Appearance

Benign melanocytic nevi are usually round or oval in shape and can vary in color from pink to dark brown. They are generally less than 6 millimeters in diameter, although some can be larger. The surface can be smooth, rough, or even hairy.

Causes

The exact cause of benign melanocytic nevi is not fully understood, but they are believed to result from a combination of genetic factors and sun exposure. They often appear during childhood and adolescence and can change in appearance over time.

Diagnosis

Diagnosis of a benign melanocytic nevus is typically made through a physical examination by a dermatologist. In some cases, a dermoscopic examination may be used to provide a more detailed view of the lesion. If there is any concern about the lesion being malignant, a biopsy may be performed.

Treatment

Most benign melanocytic nevi do not require treatment. However, if a nevus changes in appearance, becomes symptomatic, or is cosmetically undesirable, it can be removed through various methods such as surgical excision, shave excision, or laser therapy.

Prognosis

The prognosis for benign melanocytic nevi is generally excellent. They are usually harmless and do not pose any significant health risks. However, it is important to monitor them for any changes that could indicate malignancy, such as melanoma.

Related Conditions

• Dysplastic nevus
• Melanoma
• Seborrheic keratosis
• Lentigo

See Also

• Dermatology
• Skin cancer
• Nevus