Moles in Children — When They Need Checking
The question behind almost every mole appointment for a child is the same one: could this be cancer? The honest answer is that melanoma before puberty is extremely rare, and that most moles which appear, grow or darken during childhood are doing exactly what they are supposed to do.
What you should know
- New moles through childhood are normal, not a warning sign. Moles that appear between the ages of 2 and 10 tend to be the most prominent and the most persistent through life, and the count usually keeps rising through the teens and early adulthood before slowly falling again.
- A mole that enlarges in proportion to a growing child is expected behaviour. Congenital moles in particular grow with the child and commonly become darker, raised, bumpier and hairier around puberty — change on its own is not the danger signal parents fear it is.
- About 1% of babies are born with a congenital melanocytic naevus. For small and medium ones — the great majority — the lifetime melanoma risk is well under 1%; it rises to around 2.7% for large naevi and an estimated 5–10% for giant ones. That is why size, rather than appearance alone, drives how closely a birthmark is followed.
- A Spitz naevus is a benign growth that is much commoner in children than in adults. It typically grows quickly over a few months — which is exactly what frightens parents — then settles and stays unchanged for years, and it may even disappear on its own.
- The adult ABCDE rule underperforms in children. Only about 40% of melanomas in children aged 10 or under show the classic ABCDE features, against about 60% in older children; in the young the lesion is more often amelanotic — skin-coloured or red rather than brown — nodular, and thicker by the time it is diagnosed. The additional paediatric criteria are Amelanotic, Bleeding or Bump, Colour uniformity, and De novo or any Diameter.
- In Fitzpatrick skin types III–V, which is most of the children I see, pigmented lesions on the palms, soles and nails are relatively more common, and a brown nail band (longitudinal melanonychia) is markedly more prevalent in the deeper skin types. In children such nail bands are usually benign, and specialists favour careful follow-up over rushing to biopsy — a band that would be treated as suspicious in an adult often behaves quite differently in a child.
Assessment and follow-up
- Most moles can be settled in the clinic room with dermoscopy, without cutting anything. A hand-held dermatoscope shows the pigment pattern beneath the surface and separates ordinary naevi from the small number that need more.
- The most useful comparison is the child against himself, not against a textbook. A close-up photograph taken alongside a ruler, repeated at intervals, plus digital dermoscopic surveillance where indicated, answers the question “is this changing?” far better than any single examination.
- A Spitz naevus in a young child can often be watched with dermoscopic surveillance rather than removed straight away, expecting it to enlarge evenly and then stop. In older children and adolescents excision is more often advised, because the behaviour is harder to predict and it can be genuinely difficult to distinguish from melanoma.
- Large and giant congenital naevi need specialist involvement from the start — not because melanoma is likely, but because of the associated risk of neurocutaneous melanosis, estimated at 10–33% in this group, though most of those affected never develop symptoms. Small and medium naevi are followed with photographs and reassurance.
- A pigmented nail band in a child is followed rather than automatically biopsied, with photographs of its width and colour over time. Biopsy is a shared decision with the parents, reserved for a band that is widening or changing colour, that involves a single nail with pigment spilling onto the surrounding skin fold, or that comes with splitting or destruction of the nail.
Two things are true at once, and both matter. Melanoma in children is genuinely rare — extremely rare before puberty, and about 3% of childhood cancers — so the overwhelming majority of changing moles I am asked to look at are benign. But a few features should not be watched and waited on: bring your child in without delay for a mole that bleeds without being knocked, a firm lump that keeps growing, a lesion that is skin-coloured or red rather than brown, one that has ulcerated or crusted, or one that simply looks unlike all the child's other moles. In children these count for more than the adult ABCDE rule.
Frequently asked questions
My child's mole has changed — could it be cancer?
Very unlikely. Melanoma in children is rare, extremely rare before puberty, and makes up about 3% of childhood cancers; most change at this age is simply the mole growing with the child. But bleeding without an injury, a firm growing lump, a skin-coloured or red lesion, or ulceration all warrant an examination without waiting.
My child keeps getting new moles — should I be worried?
No — that is the normal pattern; moles accumulate through childhood and adolescence. What matters is the overall count more than any single mole: more than a hundred moles raises long-term melanoma risk, and is worth periodic review and good sun protection.
There's a brown line on my daughter's nail — is it dangerous?
Usually not. Brown nail bands are commoner in deeper skin tones and, in children, are benign in most cases even when the features would look worrying by adult standards. The usual approach is photography and follow-up; biopsy is reserved for a band that widens, changes colour, or spills pigment onto the skin around the nail.
Should the birthmark my child was born with be removed?
Not necessarily — the decision turns mainly on size. Small and medium naevi, which are by far the commonest, carry a melanoma risk well under 1% and are usually followed with photographs rather than operated on. Large and giant naevi need specialist assessment, and surgery may be discussed for appearance as well as for risk.
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