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Patient ReportsMerkel Cell Carcinoma: Symptoms, Causes, Diagnosis and Treatment
Written by Medicover Team and Medically Reviewed by Dr Chetana Panabaka , Dermatologists
Table of Contents
Merkel cell carcinoma (MCC) is a rare but highly aggressive type of skin cancer that develops from Merkel cells located in the outer layer of the skin. It most commonly appears on sun-exposed areas such as the face, neck, arms, and legs. Merkel cell carcinoma grows rapidly and has a high risk of spreading to nearby lymph nodes and distant organs, making early diagnosis and prompt treatment essential.
What Are the Types of Merkel Cell Carcinoma?
Merkel cell carcinoma can be classified based on its cause and stage of spread.
- Merkel cell polyomavirus (MCPyV)-positive MCC: Caused by cancer-related changes associated with the Merkel cell polyomavirus.
- UV-induced MCC: Develops due to DNA damage from prolonged ultraviolet (UV) radiation exposure.
- Localized MCC: Cancer remains confined to the skin.
- Regional MCC: Cancer has spread to nearby lymph nodes.
- Metastatic MCC: Cancer has spread to distant organs such as the lungs, liver, bones, or brain.
What Are the Symptoms of Merkel Cell Carcinoma?
Merkel cell carcinoma often begins as a painless skin nodule that grows rapidly over weeks to months.
- Painless, firm, red, pink, or violet skin nodule
- Rapid enlargement of the skin lesion
- Shiny or dome-shaped lump on sun-exposed skin
- Swollen lymph nodes near the affected area
- Unexplained weight loss in advanced disease
- Fatigue or weakness
- Symptoms related to spread of cancer to other organs
What Causes Merkel Cell Carcinoma?
Merkel cell carcinoma develops due to genetic changes in Merkel cells, often triggered by viral infection or ultraviolet radiation.
- Merkel cell polyomavirus (MCPyV) infection
- Long-term ultraviolet (UV) radiation exposure
- Weakened immune system
- Increasing age
- Previous skin cancer or extensive sun damage
When Should You See a Doctor for Merkel Cell Carcinoma?
Any rapidly growing or unusual skin lesion should be evaluated promptly. Early assessment by a dermatologist, surgical oncologist, medical oncologist, radiation oncologist, or plastic surgeon (when reconstructive surgery is needed) can improve treatment outcomes and reduce the risk of the cancer spreading.
Consult a healthcare provider if you notice:
- A painless skin nodule that grows rapidly
- Persistent skin lesions that do not heal
- Swollen or enlarged lymph nodes
- Changes in the size, color, or appearance of an existing skin growth
- Unexplained weight loss or persistent fatigue
- Any new suspicious skin lesion, especially on sun-exposed areas
Early diagnosis, prompt biopsy, and timely treatment are essential to improve survival, reduce the risk of recurrence, and prevent the spread of cancer.
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How Is Merkel Cell Carcinoma Diagnosed?
Diagnosis involves examining the skin lesion, confirming the diagnosis with a biopsy, and determining whether the cancer has spread.
- Physical examination of the skin and lymph nodes
- Skin biopsy with microscopic examination
- Sentinel lymph node biopsy
- CT scan, MRI, or PET scan for staging
- Immunohistochemistry and other pathology tests to confirm the diagnosis
How Is Merkel Cell Carcinoma Treated?
Treatment depends on the stage of the cancer, its location, and the patient's overall health.
- Surgical removal of the tumor with clear margins
- Sentinel lymph node biopsy or lymph node dissection when indicated
- Radiation therapy to reduce the risk of recurrence
- Immunotherapy with immune checkpoint inhibitors for advanced or metastatic disease
- Chemotherapy in selected cases
- Participation in clinical trials when appropriate
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What Are the Risk Factors for Merkel Cell Carcinoma?
Several factors increase the likelihood of developing Merkel cell carcinoma.
- Age over 50 years
- Fair skin and extensive sun exposure
- History of tanning bed use
- Weakened immune system, including HIV/AIDS or organ transplantation
- Merkel cell polyomavirus infection
- Previous skin cancers
What Complications Can Merkel Cell Carcinoma Cause?
Merkel cell carcinoma is highly aggressive and may cause serious complications if not treated early.
- Local recurrence after treatment
- Spread to nearby lymph nodes
- Metastasis to the lungs, liver, bones, or brain
- Organ dysfunction from advanced disease
- Treatment-related side effects such as pain, fatigue, or infection
Can Merkel Cell Carcinoma Be Prevented?
Although not all cases can be prevented, reducing ultraviolet (UV) exposure, wearing protective clothing, applying broad-spectrum sunscreen, avoiding tanning beds, performing regular skin self-examinations, and attending routine dermatology checkups can help lower the risk and support early detection.
What Is the Prognosis for Merkel Cell Carcinoma?
The prognosis depends on the stage at diagnosis, tumor size, lymph node involvement, and response to treatment. Localized Merkel cell carcinoma has a better outcome than advanced disease. Because this cancer has a high risk of recurrence, regular follow-up examinations and imaging are essential after treatment to detect recurrence or metastasis as early as possible.
Frequently Asked Questions
1. What causes Merkel cell carcinoma?
Merkel cell carcinoma is a rare and aggressive skin cancer caused by a combination of excessive ultraviolet (UV) radiation exposure, Merkel cell polyomavirus (MCPyV) infection, and changes in skin cell DNA. Not everyone infected with the virus develops this cancer.
2. What are the symptoms of Merkel cell carcinoma?
The most common symptom is a fast-growing, painless, firm red, pink, purple, or flesh-colored nodule on sun-exposed skin, especially the face, neck, or arms. The lump may bleed, ulcerate, or increase in size rapidly.
3. How is Merkel cell carcinoma diagnosed?
Diagnosis involves a skin biopsy to confirm the cancer. Additional tests such as sentinel lymph node biopsy, CT scan, PET scan, or MRI may be performed to determine whether the cancer has spread.
4. How is Merkel cell carcinoma treated?
Treatment depends on the stage of the cancer and may include surgical removal of the tumor, radiation therapy, immunotherapy (the preferred treatment for advanced disease), and, in selected cases, chemotherapy.
5. What are the risk factors for Merkel cell carcinoma?
Risk factors include older age (over 50 years), prolonged UV exposure, fair skin, a weakened immune system, infection with Merkel cell polyomavirus, and a history of other skin cancers.
6. Is Merkel cell carcinoma life-threatening?
Yes. Merkel cell carcinoma is an aggressive skin cancer that can spread quickly to the lymph nodes and other organs. Early diagnosis and prompt treatment significantly improve the chances of successful treatment and long-term survival.
7. Can Merkel cell carcinoma be cured?
Merkel cell carcinoma can often be cured if detected and treated in its early stages. Advanced disease is more difficult to treat, but newer immunotherapy medications have improved outcomes for many patients.
8. How can Merkel cell carcinoma be prevented?
You can reduce your risk by limiting sun exposure, using broad-spectrum sunscreen with SPF 30 or higher, wearing protective clothing, avoiding tanning beds, performing regular skin self-examinations, and seeking medical evaluation for any new or rapidly growing skin lumps.
