Growths (skin moles) - Causes, Treatment & When to See a Doctor

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What is Growths (skin moles)?

A skin mole, medically known as a nevus (plural: nevi), is a pigmented or non‑pigmented growth that arises from clusters of melanocytes—the cells that produce the pigment melanin. Most people have anywhere from a few to several hundred moles, and the majority are harmless. Moles can be flat or raised, smooth or rough, and may appear anywhere on the body, including areas not exposed to the sun.

While most nevi are benign, some can develop into melanoma, a dangerous form of skin cancer. Understanding the appearance, evolution, and risk factors of skin moles helps you recognize when a mole is typical and when it warrants medical attention.

Common Causes

Skin moles are usually the result of genetic and environmental influences that affect melanocyte growth. Below are the most common conditions and factors that lead to the development of moles:

• Congenital nevi: Moles present at birth; larger lesions carry a higher melanoma risk.
• Acquired (common) nevi: Appear during childhood or adolescence, often due to sun exposure.
• Sunburn and UV radiation: Ultraviolet (UV) light stimulates melanocyte proliferation.
• Hormonal changes: Puberty, pregnancy, and hormonal therapies can cause existing moles to darken or new ones to form.
• Genetic syndromes: Conditions such as Familial Atypical Multiple Mole Melanoma (FAMMM) syndrome increase mole count and melanoma risk.
• Dermatofibromas: Benign fibrous nodules that may be mistaken for pigmented moles.
• Lentigines: Sun‑induced flat brown spots that differ histologically from nevi but are often grouped with them.
• Seborrheic keratoses: Waxy, stuck‑on lesions that can mimic raised moles.
• Blue nevi: Benign, deep‑pigmented lesions that appear blue due to light scattering.
• Post‑inflammatory hyperpigmentation: Healing skin after injury or inflammation can leave a mole‑like pigmented patch.

Associated Symptoms

Most moles are asymptomatic, but certain changes can accompany them, signalling either benign evolution or a warning sign of malignancy:

• Itching or irritation.
• Bleeding or oozing, especially after trauma.
• Rough, scaly surface.
• Elevation or flattening of a previously raised mole.
• Change in color – becoming more uniform, darker, or taking on multiple shades.
• Pain or tenderness without obvious cause.
• Rapid growth over weeks or months.

When to See a Doctor

Most moles are harmless, yet you should schedule an appointment if you notice any of the following changes. The "ABCDE" rule is a quick guide for detection of potentially malignant lesions:

• A – Asymmetry: One half does not match the other.
• B – Border irregularity: Edges are ragged, scalloped, or blurred.
• C – Color variation: Shades of brown, black, red, white, or blue.
• D – Diameter: Larger than 6 mm (about the size of a pencil eraser).
• E – Evolving: Any change in size, shape, or color.

Additional red‑flag symptoms include persistent itching, bleeding, ulceration, or a mole that becomes “raised” after being flat. People with a personal or family history of melanoma, many atypical moles, or immune‑system disorders should have regular skin examinations.

Diagnosis

Healthcare providers use a combination of visual assessment, dermatoscopy, and, when needed, biopsy to evaluate moles.

1. Clinical Examination

The clinician inspects the mole with the naked eye, applying the ABCDE criteria and assessing overall skin health.

2. Dermatoscopy (Dermoscope)

A handheld magnifying device that illuminates the lesion, revealing patterns invisible to the naked eye. Dermoscopy improves diagnostic accuracy for melanoma by up to 30% compared with visual inspection alone (source: International Dermoscopy Society).

3. Digital Monitoring

High‑resolution photographs taken at baseline and at follow‑up visits allow for precise tracking of subtle changes over time.

4. Biopsy

If a mole looks suspicious, the doctor may perform one of several biopsy techniques:

• Excisional biopsy: The entire lesion is removed with a margin of normal skin—a gold standard for melanoma suspicion.
• Punch biopsy: A circular blade removes a core sample; used for larger lesions where full excision isn’t initially practical.
• Incisional biopsy: Only part of a large or thick lesion is removed for analysis.

The tissue is examined by a dermatopathologist, who classifies the lesion (e.g., common nevus, dysplastic nevus, melanoma in situ, invasive melanoma).

Treatment Options

Management depends on whether a mole is benign, atypical, or malignant.

Benign Common Nevi

• Observation: Most require no treatment; routine skin checks are sufficient.
• Electrosurgery & shave removal: For cosmetically bothersome moles, a dermatologist can shave or use radiofrequency to remove them.
• Cryotherapy: Freezing with liquid nitrogen can eliminate superficial lesions.

Atypical/Dysplastic Nevi

• Excisional removal: Recommended for lesions with worrisome features or a personal melanoma history.
• Regular monitoring: Annual dermoscopic exams to detect early transformation.

Melanoma or Suspicious Lesions

• Wide local excision: Removal with a margin of normal tissue (typically 1 cm for melanoma ≤1 mm thickness, up to 2 cm for thicker lesions).
• Sentinel lymph node biopsy: Determines if cancer has spread to nearby lymph nodes.
• Adjuvant therapies: Targeted therapy (e.g., BRAF/MEK inhibitors) or immunotherapy (e.g., pembrolizumab, nivolumab) for advanced disease.

Home Care (Post‑procedure)

• Keep the area clean; use a mild soap and pat dry.
• Apply a thin layer of petroleum jelly or prescribed ointment to promote healing.
• Cover with a sterile gauze pad for the first 24 hours, then allow the site to “air out” unless your doctor advises otherwise.
• Watch for signs of infection (increasing redness, swelling, pus, fever) and contact your clinician promptly if they appear.

Prevention Tips

While you cannot eliminate all moles, you can reduce the risk of new, atypical, or malignant lesions through sun‑smart habits and regular skin checks.

• Sun protection: Apply broad‑spectrum SPF 30+ sunscreen 15‑30 minutes before outdoor exposure; reapply every 2 hours, and after swimming or sweating.
• Protective clothing: Wear wide‑brimmed hats, UV‑protective sunglasses, and tightly‑woven shirts.
• Avoid peak UV hours: Stay in the shade between 10 am and 4 pm.
• No indoor tanning: Tanning beds emit UVA and UVB radiation that increase melanoma risk.
• Regular self‑exams: Use a mirror to examine the entire body once a month; enlist a partner for hard‑to‑see areas (back, scalp).
• Annual dermatologist visit: Particularly important for individuals with many moles, a family history of skin cancer, or fair skin that burns easily.
• Skin‑friendly diet: A diet rich in antioxidants (vitamins C, E, beta‑carotene) may aid skin health, though evidence for mole prevention is limited.
• Monitor medication effects: Some drugs (e.g., photosensitizing antibiotics, immune‑modulating agents) increase UV sensitivity; discuss additional precautions with your provider.

Emergency Warning Signs

By staying informed, practicing diligent skin protection, and seeking prompt evaluation of concerning changes, most people can manage moles safely and reduce their risk of skin cancer.

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References:

• Mayo Clinic. “Skin mole (nevus).” https://www.mayoclinic.org
• American Academy of Dermatology. “How to Perform a Skin Self‑Exam.” https://www.aad.org
• National Cancer Institute. “Melanoma Treatment (PDQ®)–Health Professional Version.” https://www.cancer.gov
• Cleveland Clinic. “Benign vs. Cancerous Moles.” https://my.clevelandclinic.org
• World Health Organization. “Skin Cancer: Prevention and Early Detection.” https://www.who.int
• International Dermoscopy Society. “Dermoscopic Criteria for Melanoma.” J Am Acad Dermatol. 2022.

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