Squamous cell carcinoma: the skin cancer that is not melanoma, the sun damage behind it, and the small surgery that cures most
Last updated September 3, 2026.
Squamous cell carcinoma, SCC, is the second commonest skin cancer, and it begins in the flat cells of the skin's upper layer, usually on the sun-exposed sites: the face, ears, lips, backs of the hands, the scalp in thinning hair, and the lower legs. It is the skin cancer of accumulated sun: decades of exposure, fair skin, outdoor work, and, importantly, any weakening of the immune system, transplant medicines above all, which multiply the risk. The reassuring center: the great majority of SCCs are cured by the small operation that removes them, done under local anesthetic, and the disease is a different, tamer creature from melanoma. But it is not the completely harmless one either: unlike its cousin basal cell carcinoma, SCC can spread, to nearby lymph nodes and rarely beyond, and the risk climbs with size, depth, location, the lip and ear especially, and immune suppression, which is why it is treated promptly and properly rather than watched. The worth-knowing parts: the precursors, the rough scaly patches called actinic keratoses, are treatable before they ever turn; the pathology report after removal answers the real question, was it all out and was it the higher-risk kind; the skin it rose from is sun-damaged skin, so the whole surface gets checked at follow-up and new ones are common; and the prevention going forward is unglamorous and effective: the hat, the shade, the sunscreen, and the skin self-checks.
What does it look like?
A firm red lump, a scaly or crusted patch, or a sore that does not heal, growing over weeks to months on a sun-exposed site, sometimes tender, sometimes bleeding or crusting, and on the lip or ear especially worth acting on fast. The field around it often shows the sun damage: the rough scaly patches of actinic keratosis. Anything on the skin that is new, growing, and not healing earns a look, and the look costs nothing.
Why does it happen?
Ultraviolet light damages the DNA of the skin's flat cells, and enough accumulated damage, decades of sun, fair skin that burns, outdoor work or outdoor living, tips a cell over into cancer. The immune system normally polices the damaged cells, which is why transplant and other immune-suppressing medicines multiply the risk so sharply, and why sun-damaged fields tend to produce more than one. It is not catching, and it is not caused by a single sunburn, but the childhood burns count in the total.
How is it treated?
- Surgery cures the great majority. Removal under local anesthetic with a margin of healthy skin is the standard, and the pathology report confirms it is all out and grades the risk.
- The higher-risk ones get more. Larger, deeper, or higher-risk SCCs, on the lip or ear, or in immune-suppressed patients, may need the staged margin-mapping surgery, lymph node checks, or radiotherapy.
- The field gets treated too. The surrounding sun-damaged skin with its actinic keratoses gets creams, freezing, or light treatment to stop the next one before it starts.
- Follow-up watches both ends. The scar site for recurrence and the whole skin for new ones, with the schedule tighter for the higher-risk and immune-suppressed.
When does it need prompt review?
A lump growing under the skin near a treated SCC, especially in front of the ear or in the neck, earns a prompt review, because that is how the rare spread to lymph nodes announces. Any new, growing, non-healing skin lesion earns a look. Pymander's escalation routing is built and tested specifically for this class of decision; see the safety architecture working paper.
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Common questions
The pathology says fully excised. Am I cured?
For that particular SCC, yes, and the pathology report is the document that says so: fully excised means the pathologist saw clear margins of healthy skin around the removed cancer, and with a straightforward SCC on the hand that is the end of that one. The honest shape of cured here has two parts: the removed cancer is gone, cured by the small operation, as the great majority are; and the skin it grew from is still 40 years of sun-damaged skin, so the question going forward is not whether that SCC returns, it is watched for, but whether the damaged field produces new ones, which is what the skin checks and the sun protection are for. That is a watching brief, not a threat, and it is the normal situation for anyone with your work history.
My brother says any skin cancer is a death sentence. Is he right?
He is carrying the melanoma story and applying it to the wrong diagnosis, and it is worth untangling because the fear is disproportionate. Melanoma is the skin cancer that earns the fear, the one that spreads early and kills, and it is also the least common of the three. Your diagnosis, squamous cell carcinoma, is a different and much tamer creature: the great majority are cured by the small operation that removes them, full stop. The honest caveat, so you are holding the accurate version and not just the comfortable one: unlike the basal cell kind, SCC can occasionally spread, usually to nearby lymph nodes, and the risk climbs with size, depth, location on the lip or ear, and immune suppression. That caveat is exactly why yours was removed promptly and checked under the microscope, and a fully-excised straightforward SCC sits at the boring end of the spectrum. Boring is what you want, and boring is what you have.
What exactly am I looking for when I check my skin?
Three words: new, growing, non-healing. The picture to hold: a firm red lump, a scaly or crusted patch that does not settle, or a sore that does not heal within a few weeks, sitting on any sun-exposed site, the face, the ears, the lips, the backs of the hands, the scalp where the hair has thinned, the forearms, the lower legs. The two tricks that make the check work: a photograph on your phone when you first spot something, because the growing question is only answerable against a record, and a monthly habit rather than a daily anxiety, the same day each month, in good light. And the rough, sandpaper-feeling patches, the actinic keratoses, are the precursors: they are worth mentioning at your review, because treating them with a cream or a freeze is how the next SCC never starts. Anything that matches new, growing, and non-healing earns a look, and the look costs nothing.
Will I get more of these? Why?
Probably some, and the why is the 40 years: your SCC grew out of sun-damaged skin, and all of the skin that weathered your working life outdoors carries the same accumulated damage, the face, the ears, the hands, the scalp. The damage is banked, and damaged fields produce new cancers the way old gardens produce weeds, which is why the doctor said what they said. The good half of the news: the new ones, found by your own monthly checks and the follow-up, are found small, and small SCCs are the easy ones, and treating the precursor patches, the actinic keratoses, thins the field before anything starts. The protection from here actually works: the hat, the sunscreen on the backs of the hands and the ears, the shade at midday. The sun's bill is paid off slowly, and you are now paying attention, which is the main thing the whole plan needs.
Is this related to melanoma? Should I be checked for that too?
They are separate cancers with separate origins, but the skin check you are now doing covers both, and the melanoma picture is worth knowing once. Melanoma is the mole cancer: the new or changing mole, the one that is asymmetric, ragged-edged, multi-colored, growing, or bleeding, and it is the one that spreads early, which is why its rules are stricter. Your SCC history does not raise your melanoma risk in any special way beyond the shared cause, the sun, but the same monthly skin check, the same photograph trick, and the same low threshold for a look apply to both: new, growing, non-healing lumps and patches for the SCC kind, new or changing moles for the melanoma kind. One check, two pictures in mind, and the follow-up appointments where the professional eye runs over the whole surface.
What changes should I actually make now? I am retired, not back on the landscaping.
The changes are small and they are worth making because the damage is cumulative and the skin keeps the accounts: the hat with a brim when you are out, because the scalp and the ears are exactly where your kind of cancer likes to grow; the sunscreen on the backs of the hands, the face, the ears, and the neck, daily in the bright months, because those are your sites; the shade at midday in summer, the gardening you still do done morning and evening; and long sleeves when it is practical. Then the two habits that finish it: the monthly skin check with the phone photograph for anything found, and the follow-up appointments kept, because the professional eye on sun-damaged skin catches things early, and early in this territory means small, simple, and sorted under local anesthetic. You are not re-arranging your life; you are paying the small ongoing bill on 40 good years outdoors.