The short answer
Treatment can include surgery, radiation therapy, immunotherapy, chemotherapy, or clinical trials. The plan depends on stage, lymph node involvement, recurrence, and overall health. The most useful conversation starts with the goal of treatment and the exact disease features driving the recommendation.
Merkel cell carcinoma grows quickly and can spread early, so staging tests and treatment often move faster than for other skin cancers.
Surgery is usually wide local excision, sometimes with removal of nearby lymph nodes; radiation after surgery lowers the chance of return.
Immunotherapy has become central for spread disease, with avelumab, pembrolizumab and retifanlimab the checkpoint inhibitors most used.
Chemotherapy is used less than it once was, mainly when immunotherapy is not a good option.
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The full explanation.
The short answer
Merkel cell carcinoma is a very rare skin cancer. It starts in touch-sensing cells in the skin's upper layer. It tends to show up on sun-exposed areas, like your head, neck, or arms. This cancer grows quickly. It can spread early too. That is why treatment usually starts soon after diagnosis. Your team may recommend more than one type of treatment together.
Surgery
Surgery is a core treatment for most people. Your surgeon removes the tumor along with surrounding tissue. This is called a wide local excision. It helps ensure no cancer cells are left behind. Say cancer has spread to nearby lymph nodes, or testing suggests it might have. Your surgeon may also remove those nodes. This is called lymph node dissection.
Radiation therapy
Radiation uses high-energy rays to kill cancer cells. It is commonly used after surgery. This treats the area around where the tumor was. It lowers the chance the cancer returns. Radiation can also be used as palliative therapy. This means its goal is to relieve symptoms and improve comfort. It fits cancer that has spread further and cannot be fully removed.
Immunotherapy
Immunotherapy has become a key treatment for Merkel cell carcinoma, especially when it has spread. These drugs, called immune checkpoint inhibitors, help your own immune system recognize and attack cancer cells. The three most commonly used are avelumab, pembrolizumab, and retifanlimab. Ask your team whether immunotherapy is part of your plan. If so, ask what side effects to watch for. These drugs work differently from chemotherapy. They can affect organs throughout your body.
Chemotherapy
Chemotherapy uses drugs delivered through your bloodstream. It reaches cancer cells throughout your body. It is used less often than it once was, now that immunotherapy has become available. It may still be considered in specific situations, particularly if immunotherapy is not a good option for you.
Why fast growth changes the conversation
Merkel cell carcinoma tends to grow quickly and spread early. This happens more than with many other skin cancers. Your team may move faster toward staging tests and treatment than you might expect for a typical skin cancer diagnosis. Ask your team directly how they assess whether your cancer has spread. Also ask how that changes which treatments they are recommending.
Side effects worth planning for
Surgery carries the usual risks of any procedure. These include infection and a real recovery period, along with a scar at the treated site. Radiation to the skin can cause redness, irritation, and fatigue in the treated area. Immunotherapy can cause inflammation in organs it is not meant to target. This includes the skin, gut, lungs, or hormone glands. Report new or unusual symptoms during treatment. Do not assume they are unrelated.
Which symptoms cannot wait
Contact your care team the same day for a fever of 100.4°F (38°C) or higher, new shortness of breath, severe diarrhea, or a widespread new rash. These can signal a serious immunotherapy side effect. Also call for signs of infection at a surgical site, such as growing redness, swelling, or drainage. These need prompt evaluation, not a wait for your next scheduled visit.
Chemotherapy changes what to do about that fever. If you are having chemotherapy now, or stopped within the last few weeks, do not wait on a same-day call. CDC treats a fever during chemotherapy as a medical emergency, because your white cell count can be too low to hold an infection back. Ring your care team's urgent number as soon as you see the reading, day or night. If you cannot get through to them quickly, go to an emergency department and say at the desk that you are on chemotherapy.
What to ask your care team
- Has my cancer spread to lymph nodes or elsewhere, and how was that checked?
- Would surgery, radiation, immunotherapy, or a combination fit my situation best?
- What side effects should I expect from immunotherapy, and which need a same-day call?
- How often will I be checked for recurrence after treatment?
Sources
Words to know
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Common questions
Why is my team moving so fast?
Merkel cell carcinoma tends to grow quickly and spread early, more than most skin cancers do. That is why staging tests and treatment often start sooner than you might expect. Ask directly how they are checking whether it has spread, and how that changes what they recommend.
Which immunotherapy drugs are used?
The immune checkpoint inhibitors most used here are avelumab, pembrolizumab and retifanlimab. They work differently from chemotherapy and can cause inflammation in organs they are not aimed at, including skin, gut, lungs and hormone glands.
Is chemotherapy still used?
Less often than it once was, now that immunotherapy is available. It may still be considered in specific situations, particularly if immunotherapy is not a good option for you.
Which symptoms should not wait?
Contact your team the same day for a fever of 100.4 F (38 C) or higher, new shortness of breath, severe diarrhea, or a widespread new rash, which can signal a serious immunotherapy side effect. Also call for growing redness, swelling or drainage at a surgical site. One exception: on chemotherapy, or in the weeks after it, that fever is an emergency rather than a same-day call, so ring your team's urgent number the moment you see it, at any hour, and head to an emergency department only if you cannot reach anyone.
Questions to ask your doctor
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Sources last checked: 2026-08-13 what this meansLast updated: 2026-08-18Next planned review: 2027-01-22
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How this page was created
Cancer Explained does not originate medical claims. Every page restates guidance already published by the National Cancer Institute, the CDC, the USPSTF and the FDA, in plain language, with the source cited so you can check the original yourself. AI does the translating and organizing; automated checks test claims, citations, clarity and safety before anything publishes. We do not employ clinicians and do not intend to — our work is translation and navigation, not clinical judgment. Nothing here is personal medical advice, and no page can account for your particular situation.
Editorial status: Source checked — This page was written with AI assistance and checked line by line against the sources listed on it. That confirms the sources support what the page says. It is not a medical review, and it does not confirm the page is complete or right for your situation.
Human medical review: not completed. Pages here are not signed off by a clinician before they publish. That is not an oversight we are quietly working around: we restate published guidance and cite it, so the authority belongs to the source rather than to us, and every page names where its claims come from — you can verify us instead of trusting us. Where a volunteer clinician has reviewed a page, their name and credentials appear on it; where no name appears, no clinician has checked it. We are glad to have reviewers and are recruiting them, and we do not hold pages back waiting for one. Use this site to understand your situation and to ask better questions of the people treating you.
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