Melanoma (Skin Spot Changes) - Causes, Treatment & When to See a Doctor

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What is Melanoma (Skin Spot Changes)?

Melanoma is a malignant tumor that originates from melanocytes – the pigment‑producing cells in the skin. When a mole or “skin spot” changes in size, shape, color, or texture, it can be a sign that melanoma is developing. Although melanoma accounts for only about 1 % of skin cancers, it causes the majority of skin‑cancer deaths because it can spread (metastasize) quickly to lymph nodes and internal organs.

Early detection is essential. Most melanomas arise on sun‑exposed areas such as the back, legs, arms, and face, but they can also appear on parts of the body that rarely see sunlight, such as the soles of the feet, palms, or under the nails.

Common Causes

Melanoma is not caused by a single factor. It usually results from a combination of genetic susceptibility and environmental exposures. Below are the most frequent contributors:

• Ultraviolet (UV) radiation: Both natural sunlight and artificial sources (tanning beds) cause DNA damage in melanocytes.
• Fair skin, red or blond hair, and blue/green eyes: Less melanin offers less natural protection against UV light.
• Family history of melanoma: Inherited gene mutations (e.g., CDKN2A, BRAF) increase risk.
• Personal history of skin cancer: Prior melanoma or other skin cancers raise the chance of a new lesion.
• Numerous or atypical moles (dysplastic nevi): Large, irregularly shaped moles are precursors to melanoma.
• Weakened immune system: Organ‑transplant recipients, HIV infection, or immunosuppressive medications make it harder to fight early cancer cells.
• Exposure to certain chemicals: Arsenic, polychlorinated biphenyls (PCBs), or coal‑tar products have been linked to higher skin‑cancer rates.
• Radiation therapy: Prior therapeutic radiation can increase the risk of secondary skin cancers.
• Habitual sunburns in childhood: Early‑life burns are a strong predictor of later melanoma.
• Older age: While melanoma can affect any age, incidence rises after age 50.

Associated Symptoms

Most melanomas are initially painless, but certain changes may accompany the primary spot:

• Itching, tenderness, or burning sensation in the lesion.
• Bleeding or oozing, especially after minor trauma.
• Scabbing that does not heal.
• Rapid growth – the spot enlarges over weeks rather than months.
• Satellite lesions: small, dark spots near the main melanoma.
• Lymph node swelling in the area draining the tumor (e.g., a lump in the neck or armpit).
• Systemic symptoms such as unexplained weight loss, fatigue, or night sweats (more common in advanced disease).

When to See a Doctor

Any new, changing, or unusual spot on the skin warrants professional evaluation. Specific warning signs (often remembered by the ABCDE rule) include:

• Asymmetry: One half of the mole does not match the other.
• Border irregularities: Edges are ragged, blurred, or notched.
• Color variation: Multiple shades of brown, black, red, white, or blue.
• Diameter: Larger than 6 mm (about the size of a pencil eraser), though some melanomas are smaller.
• Evolving: Any change over time – in size, shape, color, or symptoms.

Additional situations that should prompt an appointment include:

• A mole that bleeds, itches, or becomes painful.
• New pigmented lesions in people with a strong family or personal history of melanoma.
• Any lesion on the palms, soles, under the nails, or mucous membranes.
• Sudden appearance of multiple new moles in adulthood.

Diagnosis

Diagnosing melanoma involves a step‑wise approach:

1. Clinical skin examination

Dermatologists use a dermatoscope – a magnifying lens with polarized light – to examine the structure of the pigment network, vascular patterns, and other subtle features.

2. Digital imaging & monitoring

High‑resolution photographs or smartphone‑based apps can track lesions over time, helping to detect subtle evolution.

3. Biopsy

• Excisional biopsy: The entire lesion (plus a margin of normal skin) is removed and sent for pathology. This is the preferred method for suspected melanomas.
• Punch or shave biopsy: May be used for very large lesions or those in difficult locations, but can sometimes miss deeper invasion.

The pathology report includes the Breslow thickness (depth in millimeters), ulceration status, mitotic rate, and whether the margins are clear – all crucial for staging.

4. Staging investigations (if invasive melanoma is confirmed)

• Sentinel lymph‑node biopsy (SLNB) – to detect microscopic spread to nearby lymph nodes.
• Imaging studies such as ultrasound, CT, PET‑CT, or MRI for high‑risk patients.

Treatment Options

Treatment depends on the tumor’s thickness, location, and whether it has spread.

1. Surgical Management

• Wide local excision: Removes the melanoma with a safety margin of normal tissue (usually 1 cm for lesions ≤1 mm thick, up to 2 cm for thicker tumors).
• Mohs micrographic surgery: In cosmetically sensitive areas (e.g., face), this technique spares healthy tissue while ensuring clear margins.
• Sentinel lymph‑node biopsy: If positive, a complete lymph‑node dissection may be recommended.

2. Adjuvant Therapies (after surgery)

• Immunotherapy: Checkpoint inhibitors such as pembrolizumab (Keytruda) or nivolumab (Opdivo) boost the immune system’s ability to attack residual cancer cells.
• Targeted therapy: For tumors with BRAF V600E/K mutations, agents like vemurafenib, dabrafenib, or combination BRAF/MEK inhibitors (trametinib) improve progression‑free survival.
• Interferon‑alpha: Historically used but now less common due to side‑effects.

3. Systemic Treatment for Advanced Disease

• Combination immunotherapy (e.g., nivolumab + ipilimumab) for metastatic melanoma.
• Clinical trial participation – many novel agents are under investigation.

4. Home & Supportive Care

• Wound care after excision – keep the site clean, follow surgeon’s dressing instructions, and watch for infection.
• Sun‑protection measures (see Prevention Tips).
• Psychological support – counseling or support groups for patients coping with a cancer diagnosis.

Prevention Tips

While genetics cannot be changed, most melanoma risk is modifiable through sun‑safety behaviors:

• Apply a broad‑spectrum sunscreen (SPF 30 or higher) 15‑30 minutes before outdoor exposure; reapply every 2 hours and after swimming or sweating.
• Seek shade between 10 a.m. and 4 p.m., when UV rays are strongest.
• Wear protective clothing: long‑sleeved shirts, wide‑brim hats, and UV‑blocking sunglasses.
• Avoid indoor tanning beds – they emit concentrated UV‑A and UV‑B radiation.
• Perform regular skin self‑exams (monthly) and keep a log of any new or changing spots.
• Schedule a full‑body skin exam by a dermatologist at least once a year, or more often if you have high risk.
• Consider genetic counseling if you have multiple affected relatives.
• Maintain a healthy immune system – balanced diet, regular exercise, adequate sleep, and avoidance of unnecessary immunosuppressive drugs.

Emergency Warning Signs

If you notice any of the following, seek immediate medical attention (go to the nearest emergency department or call emergency services):

• Rapid, uncontrolled bleeding from a skin lesion.
• Severe pain, swelling, or ulceration that worsens quickly.
• Sudden appearance of a large, raised, or ulcerated mass.
• Signs of infection: red streaks spreading from the lesion, fever, chills.
• New neurological symptoms (e.g., headaches, vision changes) suggesting metastatic spread to the brain.

Early recognition and prompt treatment dramatically improve survival rates for melanoma. If you have any doubt about a skin spot, it is always safer to have it evaluated by a dermatologist.

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References: Mayo Clinic, 2024; American Academy of Dermatology; National Cancer Institute (NCI); Centers for Disease Control and Prevention (CDC); World Health Organization (WHO); Cleveland Clinic; peer‑reviewed articles in Journal of Clinical Oncology and Dermatology (2023‑2024).

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