Melanoma is a skin cancer that starts in the cells that make pigment. It is much less common than other skin cancers but causes most skin cancer deaths, because it can spread. Found and removed while it is still thin, it is usually curable. Benign moles with unusual clinical features that can resemble melanoma.
The same eight facts on every condition comparison.
Superficial spreading melanoma The most common, a growing flat spot.
Nodular melanoma A fast-growing raised bump.
Lentigo maligna melanoma Slow, flat brown patch on sun-damaged skin.
Acral lentiginous melanoma On palms, soles or under nails.
Atypical Moles The pigmented spot has a darker center and an irregular outer edge.
Abnormal pigment cells escape normal growth controls and multiply within the skin. Some melanomas grow into deeper tissue, and the depth of invasion helps determine their stage.
Benign pigment-cell growth can produce a mole with an unusual visible appearance. Surface appearance and microscopic findings are different assessments, so atypical appearance alone does not establish cancer.
Melanoma. More common in adults, but a concerning changing lesion needs assessment at any age.
Atypical Moles. Often develops during adolescence or early adult life.
Melanoma starts when pigment cells develop DNA damage and grow out of control. Ultraviolet light is the main cause of that damage for most melanomas.
A benign melanocyte proliferation has an atypical appearance; clinical appearance and pathology are different assessments.
About 1 in 10 people with melanoma have a family history of it. Genes such as CDKN2A raise the risk.
Evidence labels come from each condition’s own treatment list.
The treatment that cures the great majority of thin melanomas. Once the diagnosis is confirmed, a second and wider operation removes a margin of surrounding skin, with the width set by how thick the melanoma was. The scar is longer than most people expect, and that is the trade that stops it coming back at the site. Anything pigmented that is removed, anywhere, should be sent for pathology.
Above a certain thickness, the first lymph node the area drains to is located with a tracer and removed to see whether cells have reached it. It is a staging test rather than a treatment: it tells you where you stand and shapes what is offered next. It carries its own risks, including lasting swelling of the limb, so it is offered as a discussion rather than an automatic step.
Used at some centers for lentigo maligna on the face, where sparing skin matters and the true edge of the pigment is hard to see. It is not the standard operation for melanoma generally — wide excision is, and the evidence sits with that. If Mohs is offered to you, it is fair to ask why it suits this particular lesion in this particular place.
Nothing diagnoses melanoma except a biopsy. Where it is possible, the whole spot is removed with a narrow margin rather than sampled, because the pathologist needs the full depth to measure the thickness, and thickness sets everything that follows. It is done under local anesthetic and usually takes under half an hour. A biopsy does not make melanoma spread, and believing that it does is a common cause of delay.
Atypical appearance alone does not require removing every mole; suspicious change may need tissue diagnosis.
Melanoma does not progress on a fixed schedule. Some variants change over years, others over weeks, so this is the sequence, not a timetable. Skin checks continue for years after treatment, because a second melanoma and a recurrence are both possible, and close relatives are usually advised to have their skin checked.
Most atypical moles remain benign, but their presence can indicate a higher melanoma risk. Monitoring follows personal risk; a changing mole needs examination rather than reassurance based on its label.
Cells travel to the nearest nodes first
A lump near a previous melanoma site is significant and checked promptly.
Treated by an oncology team
Melanoma can spread to organs far from the skin. Immunotherapy and targeted therapy have changed outcomes substantially in the last decade.
Multiple atypical moles can mark increased melanoma risk; not every one requires removal.
Arrange prompt assessment of a new or changing unusual spot, especially an evolving lesion or one that bleeds. Diagnosis requires clinical evaluation and usually biopsy.
Seek prompt assessment for a changing mole, an unusual new lesion or a spot unlike your others.
It varies more than people expect. The common superficial spreading variant often changes over months to a few years. Nodular melanoma can grow downward over weeks to a few months. You cannot tell which you have by looking, so a changing spot gets examined now, not in six months.
No, and this belief causes delay. Removing a suspicious lesion is how melanoma is diagnosed and how the thickness is measured, and thickness determines the treatment. There is no evidence a biopsy spreads it.
No. Most melanomas arise as new spots, so removing moles does not remove the risk and means many scars for no benefit. Many or unusual moles are a reason for regular examinations, not preventive removal.
Usually not. Pigmented nail bands are common and often normal in deeper skin tones, frequently on several nails at once. It needs examining if it is on one nail only, if it is getting wider, if it has more than one shade, if the nail is splitting, or if the pigment spreads onto the skin around it.
The melanoma is treated, but you are not discharged. Having had one raises the chance of a second, so skin checks continue for years, and close relatives are usually advised to have their skin examined. Ask how often yours should be and who arranges it.
Yes. Sun exposure raises risk, but melanoma also occurs on soles, palms, under nails and on skin never exposed, and in people who have never burned. Sun history changes your risk profile, not whether a particular spot should be looked at.
Benign moles with unusual clinical features that can resemble melanoma.
Avoid picking or home removal. Protect exposed skin from the sun.
Seek prompt assessment for a changing mole, an unusual new lesion or a spot unlike your others.
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