I Just Had a Melanoma. What Are My Odds of Getting Another One?

A second melanoma is a new cancer, not the first one coming back

Three different things can happen after a melanoma, and they get mixed up. A recurrence means the original melanoma has come back at or near the scar. Spread, or metastasis, means cells from the original melanoma have traveled to lymph nodes or beyond. A second primary melanoma is a brand-new melanoma that starts on its own, usually somewhere else on the skin. This page is about the third one.

The distinction matters because the odds are separate. A thin melanoma that was fully removed has a low chance of coming back or spreading. The same person still has a raised chance of growing a new one, because the skin, the moles, and the sun history that produced the first melanoma are all still there. A new spot in or near the scar needs to be seen either way. The biopsy, not the location, decides what it is.

Two kinds of numbers: about 9 times, and about 4 in 100

You will hear two kinds of numbers, and both are true at once. The first is a relative risk. In a U.S. cancer registry study of 89,515 melanoma survivors, new melanomas occurred at about 9 times the rate expected in the general population. That sounds alarming until you remember that the general population's rate is low.

The second is an absolute risk, the share of people it actually happens to. In the largest recent U.S. study, 152,811 people treated for an invasive melanoma were followed through the national SEER registry. A second melanoma was found in 3.9 percent within 5 years and in 6.7 percent within 10 years. Put the other way, about 93 of every 100 had not had a second melanoma ten years on.

The longer a study runs, the higher the number climbs, because the risk does not stop. Older U.S. data put the 20-year figure at 5.3 percent. In the Netherlands it was 5 to 6 percent at 20 years. In Queensland, Australia, which has the highest melanoma rates in the world, 16.3 percent of survivors had a second invasive melanoma within 40 years. Specialist clinics that see people with many moles or strong family histories report higher numbers, around 8 to 11 percent at 5 years, and studies that also count melanoma in situ, the earliest form, run higher too. When you read a figure, ask which kind of number it is and who was counted.

When: the first year is busiest, and the risk does not expire

The chance of a second melanoma is highest right after the first. In the U.S. registry study, the rate in months 2 through 12 after diagnosis was about 17 times the general population's. Part of that is real, and part is detection: the first full-skin examination after a melanoma diagnosis finds spots that were already there.

After the first year the risk settles but does not go away. In a large California health plan, about 2 percent of melanoma patients had a second melanoma in the first year, and then roughly 1 percent per year, year after year, through 15 years of follow-up. In the Netherlands, people who were still clear at 5 years had a further 4.6 percent chance over the next 5 years. And in the U.S. registry, people 20 or more years out were still developing melanoma at more than 5 times the average rate.

That is the most useful fact on this page. A quiet first year is good news. It is not a reason to stop looking.

What raises your personal risk

A 2024 analysis pooled 27 studies covering 413,181 people with melanoma to see who is most likely to get another. The strongest factor was an inherited change in the CDKN2A gene, found in a small number of melanoma-prone families, which raised the odds about fivefold. Having one or more atypical moles tripled the odds. Having many moles of any kind raised them about 2.6-fold, and a family history of melanoma about 1.8-fold. Men, people with fair skin, and older people also had higher rates: about 46 percent higher for men, 44 percent higher for light skin, and 19 percent higher for every additional 10 years of age.

Sun and tanning matter too. In one U.S. series, people who had used indoor tanning beds had nearly three times the odds of multiple melanomas. An Australian study concluded that people who have had a melanoma can expect to reduce their risk of another by cutting back on recreational sun exposure, whatever their age.

One thing that does not lower your risk is having had a thin melanoma. Studies disagree about whether a thicker first melanoma raises or lowers the chance of a recorded second one, but none of them puts people with thin or in situ melanomas in a low-risk group.

My first melanoma was in situ. Does that change anything?

Melanoma in situ is melanoma confined to the top layer of the skin. Removing it cures it, and it does not spread. But it carries the same message about your skin. In a Dutch registry, the 20-year chance of a later invasive melanoma was 6.2 percent after an in situ first melanoma and 5.0 percent after an invasive one. In the U.S. registry, the rate of a new invasive melanoma after an in situ melanoma was 8 to 12 times the general population's, close to the figure after an invasive melanoma. An in situ melanoma still means lifelong skin exams.

Where on the body

Across studies, about a third to a half of second melanomas appear in the same general body region as the first, more often than chance would predict. Most appear somewhere else. That is why a proper follow-up exam covers the whole skin, including the scalp, the back, the buttocks, and the soles of the feet, and not just the scar.

Will a second melanoma be worse than the first?

Usually it is found earlier. In a Dutch registry of 2,284 people with more than one melanoma, the median thickness fell from 0.90 millimeters for the first melanoma to 0.65 millimeters for the second, because someone was looking. Thinner melanomas are more often cured by surgery alone.

But not always. In the same registry, the second melanoma was a higher stage than the first in 16.2 percent of people, the same stage in 48.7 percent, and a lower stage in 35.1 percent. Each invasive melanoma carries its own risk and needs its own staging and treatment. Several large population studies that corrected for the statistical quirks of counting survivors found that people with two or more invasive melanomas had, on average, a somewhat worse long-term outlook than people with one; one large study found no significant difference. An additional in situ melanoma did not change melanoma survival in one large analysis. Finding the next melanoma early is what follow-up is for.

Other skin cancers, and other cancers

Melanoma survivors also get more of the common skin cancers. Pooled studies put basal cell carcinoma at about 5 times the general rate and squamous cell carcinoma at about 2.6 times; roughly 4 percent and 2.5 percent of melanoma survivors developed one during follow-up. The same sun that caused the melanoma caused these, and the same skin exam finds them.

Cancers inside the body show small increases in registry data, on the order of 10 to 30 percent for breast, prostate, and non-Hodgkin lymphoma, with a larger relative increase for thyroid cancer in one U.S. analysis. Some of that is shared risk and some is simply being examined more often. In Australian data, the 5-year chance of another melanoma, counting in situ, was 7.6 percent, higher than the chance of prostate cancer in men or breast cancer in women, each 2.8 percent, or colon cancer at 0.6 percent. Keep your usual age-appropriate cancer screening. A genetics visit is reserved for selected families.

Your follow-up plan

National guidelines agree on the substance, even if the calendars differ. The National Comprehensive Cancer Network calls for at least an annual skin examination for life. For stage 0 through IIA melanoma it recommends a history and physical examination, with attention to the skin and lymph nodes, every 6 to 12 months for 5 years and then yearly. For stage IIB and higher it recommends every 3 to 6 months for 2 years, then every 3 to 12 months for 3 years, then yearly. The American Academy of Dermatology and the European guidelines say the same in substance, and all of them admit that the exact intervals rest on limited evidence. Your surgeon sets your schedule from your stage, your moles, and your family history.

• A full-skin examination by a dermatologist on the schedule you were given, for life. It looks for a new melanoma and for the common skin cancers that follow the same sun.
• A self-check about once a month, which is the NCCN patient guide's advice. Use a mirror or a partner for your back and scalp, and call sooner for any new or changing spot.
• Total-body photography and digital dermoscopy for people with many moles or more than one melanoma. In specialist programs for very-high-risk patients examined every 6 months with these tools, most new melanomas were found in situ or under 1 millimeter thick. No trial has proved that any schedule or tool saves lives; they find melanomas early, which is the point. Ask us whether this fits your situation.
• Sun protection and no tanning beds, at any age.
• Genetic counseling if you have had 3 or more invasive melanomas, including one before age 45, or if 3 or more relatives on one side of your family have had melanoma or pancreatic cancer.
• Routine scans are not how a new skin melanoma is found. Scans look for spread and are used only when your stage calls for them.

What the numbers cannot tell you

Every study on this page defined a second melanoma a little differently, counted in situ lesions differently, and followed a different population, from a national registry to a clinic that sees only the highest-risk patients. Surveillance itself finds more. No study can give you a personal percentage. What the research gives you is a range, a list of what raises and lowers it, and a clear plan. That is enough to act on.