Melanoma skin lesion - Causes, Treatment & When to See a Doctor

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What is Melanoma skin lesion?

Melanoma is a type of skin cancer that originates from melanocytes – the cells that produce the pigment melanin, which gives skin its colour. A melanoma skin lesion is any abnormal growth, spot, or patch on the skin that is suspicious for this malignancy. While melanoma accounts for only about 1% of skin cancers, it is responsible for the majority of skin‑cancer‑related deaths because it can spread (metastasize) quickly if not detected early.

The lesion may appear as a new mole or a change in an existing one. Early detection dramatically improves outcomes; the 5‑year survival rate exceeds 99% when melanoma is caught at the in‑situ (stage 0) stage, but drops sharply once it invades deeper layers or spreads to distant organs.

Common Causes

Melanoma itself is not caused by a single factor, but several risk factors increase the likelihood of developing a malignant skin lesion. The following are the most important contributors:

• Ultraviolet (UV) radiation exposure: Cumulative sun exposure and intermittent intense UV bursts (sunburns) damage DNA in melanocytes.
• Indoor tanning devices: UV‑A light from tanning beds carries a similar or higher risk than natural sunlight.
• Fair skin, light hair, and light eye colour: Less natural melanin means less protection from UV damage.
• Family history of melanoma: Genetic predisposition, especially mutations in CDKN2A, BRAF, or NRAS genes.
• Personal history of melanoma or other skin cancers: Prior lesions increase future risk.
• Large number of melanocytic nevi (moles): More than 50 ordinary moles or any atypical (dysplastic) nevi raise risk.
• Immunosuppression: Organ‑transplant recipients or patients on long‑term immunosuppressive therapy have higher rates.
• Certain genetic syndromes: Examples include familial atypical multiple mole melanoma (FAMMM) syndrome and xeroderma pigmentosum.
• Geographic location: Living closer to the equator or at high altitude increases UV intensity.
• Age and gender: Melanoma is slightly more common in men after age 50, but it can affect children and teenagers (especially the “spitzoid” variant).

Associated Symptoms

When a lesion is malignant, patients often notice additional warning signs beyond the lesion’s appearance. Common associated symptoms include:

• Itching, tenderness, or pain in the lesion.
• Bleeding or oozing, especially after minor trauma.
• Rapid growth in size over weeks or months.
• Irregular or changing colour (multiple shades of brown, black, red, blue, or white).
• Presence of a raised, ulcerated, or crusted surface.
• Swollen lymph nodes near the lesion (often in the neck, armpit, or groin).
• Unexplained weight loss, fatigue, or night sweats if the tumour has metastasized.

When to See a Doctor

Because melanoma can be curable when caught early, you should seek medical evaluation promptly if you notice any of the following:

• A new skin spot or mole that appears after age 20.
• Any change in an existing mole’s size, shape, colour, or texture.
• Asymmetry – one half of the lesion does not match the other.
• Irregular, scalloped, or poorly defined borders.
• Colour that is not uniform – shades of brown, black, red, blue, or white.
• Diameter larger than 6 mm (about the size of a pencil eraser) – though melanomas can be smaller.
• Evolution – any change over time (the “E” in the ABCDE rule).
• Persistent itching, bleeding, or ulceration.

Diagnosis

Healthcare professionals use a stepwise approach to evaluate a suspicious lesion:

1. Clinical Examination

Dermatologists perform a thorough skin exam, often using a dermatoscope (a handheld magnifying device). The ABCDE criteria help identify high‑risk features.

2. Skin Biopsy

The definitive diagnosis requires a tissue sample. Common biopsy types include:

• Excisional biopsy: Entire lesion removed with a narrow margin – preferred for most suspected melanomas.
• Punch biopsy: Circular tool removes a core of tissue; used when the lesion is large.
• Incisional (or shave) biopsy: Removes part of the lesion; less ideal but sometimes necessary.

Pathologists examine the specimen under a microscope, reporting Breslow depth (thickness in mm), ulceration status, mitotic rate, and any spread to nearby tissue.

3. Staging Tests (if invasive)

If the melanoma invades beyond the epidermis, further workup determines the stage:

• Sentinel lymph node biopsy – identifies microscopic spread to regional lymph nodes.
• Imaging studies (ultrasound, CT, PET/CT, MRI) – assess distant metastasis.

4. Molecular Testing

Advanced labs may test for BRAF, NRAS, or KIT mutations. Findings guide targeted systemic therapy for advanced disease.

Treatment Options

Treatment is tailored to the stage, location, and patient’s overall health. Options include surgical, medical, and supportive measures.

Surgical Management

• Wide local excision: Removal of the melanoma with a margin of normal skin (typically 1 cm for thin lesions, up to 2 cm for thicker tumours).
• Sentinel lymph‑node biopsy (SLNB): Performed at the time of excision if the tumour is >0.8 mm thick or has high‑risk features.
• Completion lymph‑node dissection: May be recommended if SLNB is positive.

Adjuvant (post‑surgical) Therapy

For high‑risk stage II–III disease, additional treatments improve recurrence‑free survival:

• Immune checkpoint inhibitors: Pembrolizumab, nivolumab, or the combination ipilimumab + nivolumab.
• Targeted therapy for BRAF‑mutated melanoma: Combination of dabrafenib (BRAF inhibitor) and trametinib (MEK inhibitor).
• Interferon‑α: Less commonly used today due to toxicity.

Advanced (Stage IV) Disease

When melanoma has spread to distant organs, systemic therapy is the mainstay:

• Immune checkpoint inhibitors (PD‑1 or CTLA‑4 blockers).
• Targeted BRAF/MEK inhibitor combos for patients with BRAF V600E/K mutations.
• Oncolytic virus therapy (talimogene laherparepvec – T‑VEC) for injectable skin or nodal metastases.
• Clinical trial enrollment – a valuable option for many patients.

Radiation Therapy

Used selectively for brain metastases, unresectable lymph‑node disease, or as palliative care for bone lesions.

Home & Supportive Care

• Wound care after surgery – keep the site clean, follow dressing instructions, and watch for infection.
• Sun protection – essential to prevent new lesions.
• Psychological support – counseling or support groups can help cope with anxiety and body‑image concerns.
• Regular skin self‑exams and follow‑up visits as recommended by your dermatologist or oncologist.

Prevention Tips

Many melanomas are preventable by reducing UV exposure and monitoring skin changes.

• Use broad‑spectrum sunscreen: SPF 30 or higher, applied 15 minutes before sun exposure and reapplied every 2 hours (or after swimming/sweating).
• Seek shade: Especially between 10 a.m. and 4 p.m. when UV intensity peaks.
• Wear protective clothing: Long‑sleeved shirts, wide‑brim hats, and UV‑blocking sunglasses.
• Avoid indoor tanning: Tanning beds emit carcinogenic UV‑A radiation.
• Regular skin checks: Perform a full‑body self‑exam monthly; enlist a partner to examine hard‑to‑see areas.
• Professional dermatology exams: Yearly (or more frequently if high‑risk) full skin assessments by a dermatologist.
• Stay informed about family history: If a close relative had melanoma, discuss genetic counseling.
• Maintain a healthy immune system: Adequate sleep, balanced diet, and avoidance of unnecessary immunosuppressive medications.

Emergency Warning Signs

Key Take‑aways

Melanoma skin lesions are potentially life‑threatening but highly treatable when identified early. Understanding risk factors, performing regular self‑exams, protecting skin from UV damage, and seeking prompt medical evaluation for any suspicious change are the cornerstones of effective prevention and early detection.

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References: Mayo Clinic, 2024; Centers for Disease Control and Prevention (CDC), 2023; National Cancer Institute (NCI), 2024; American Academy of Dermatology (AAD), 2023; WHO Classification of Tumours of the Skin, 2022; Cleveland Clinic, 2024.

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