Guide · Café au lait spots
Café au Lait Spots when to have them checked, and what laser can and cannot do
Café au lait spots are common, harmless birthmarks, but several of them in a child can be an early sign of neurofibromatosis type 1. Here is when to see a doctor, and, for adults who want a spot lighter, what pico and Q-switched lasers can honestly achieve in Asian skin.
Quick answer
- Café au lait spots are flat, evenly coloured light-to-medium brown birthmarks with a clear edge, usually present at birth or appearing in early childhood. They are harmless, do not turn into cancer, and about one in ten people has one or two.
- Six or more spots larger than 5 mm in a child before puberty, or larger than 15 mm after puberty, is one of the criteria for neurofibromatosis type 1 (NF1). A child with several spots, new spots appearing, or freckles in the armpits or groin should be seen by a GP, paediatrician or dermatologist.
- In adults who want a spot lighter, Q-switched and picosecond lasers are the usual options, but results are unpredictable. In a meta-analysis of 19 studies, about three in four people reached at least 50% clearance and about four in ten reached 75%; recurrence averaged around 13%, and spots with jagged edges responded better than smooth-edged ones.
- Darkening after laser (post-inflammatory hyperpigmentation, PIH) is a risk in Asian skin, so a test patch comes first. At IN Eternity Clinic, Dr Sin Yong performs Pico Laser and Laser Toning, priced at consultation; SkinRev Lab does not perform lasers, and facials do not fade café au lait spots.
The basics
What café au lait spots are
Café au lait means 'coffee with milk', which describes the colour: a flat, evenly coloured light-to-medium brown patch with a sharp, clear border. They range from a few millimetres to more than 20 cm across. Most are present at birth or appear in early childhood, grow in proportion as the child grows, and may look darker after sun exposure.
They are caused by extra pigment in the skin, are benign, and do not become cancer. Left alone, they usually persist for life. An isolated spot in an otherwise healthy person needs no treatment; whether to lighten one is a cosmetic choice.
How many
One spot, two spots, or several?
The number and size of spots matter more than how dark they are. Roughly one in ten people has one or two café au lait spots and nothing else. People with NF1, by contrast, almost always have six or more. Doctors may also watch a child more closely when spots keep appearing over time, because more can surface during the first years of life.
Other, rarer conditions are linked to café au lait spots too. McCune-Albright syndrome tends to cause fewer, larger spots with jagged edges that often stop at the midline, and Legius syndrome causes multiple spots and sometimes freckling without the nerve tumours of NF1.
| What you see | What it usually means | What to do |
|---|---|---|
| One or two spots in a well child | Usually an isolated birthmark | Mention it at a routine check |
| Spots that keep increasing in number | Needs watching | See a GP or paediatrician |
| Six or more spots over 5 mm before puberty | One criterion for NF1 | See a doctor for assessment |
| Six or more spots plus freckles in the armpits or groin | Two NF1 criteria; Legius syndrome is also possible | See a doctor promptly |
| A large, jagged-edged spot with early puberty or bone problems | Possible McCune-Albright syndrome | See a doctor |
| A spot that is raised, lumpy or changing | May not be a café au lait spot | See a doctor before any treatment |
Children
When several café au lait spots in a child need a doctor
Neurofibromatosis type 1 is a genetic condition that affects the skin, nerves, eyes and bones. Its diagnostic criteria were revised by an international consensus group in 2021. In a person without a parent who has NF1, two or more of the following are needed; in a child of a parent with NF1, one is enough.
Pigment findings alone, spots and freckling, can also be caused by Legius syndrome, so a doctor may suggest genetic testing to tell them apart. Freckling in the skin folds usually appears between about two and five years of age, and children in whom NF1 is suspected are advised to have yearly eye checks, because tumours of the optic nerve can appear before age six. A GP or polyclinic can refer you to a paediatrician, dermatologist or genetics service.
- Six or more café au lait spots larger than 5 mm before puberty, or larger than 15 mm after puberty
- Freckling in the armpits or groin
- Two or more neurofibromas of any type, or one plexiform neurofibroma
- An optic pathway glioma (a tumour of the optic nerve)
- Two or more Lisch nodules in the iris, or two or more choroidal abnormalities
- A distinctive bone lesion, such as sphenoid wing dysplasia or bowing of the shin bone
- A disease-causing variant in the NF1 gene
Adults
A brown patch in an adult: is it a café au lait spot?
Many adults have had a café au lait spot since childhood and only start to mind it later, often when it darkens after sun. A brown patch that appears for the first time in adulthood may be something else, such as a sun spot, a speckled birthmark (naevus spilus), a Becker's naevus or melasma, which behave differently and need different treatment.
Any spot that is new and changing, raised, has several colours or an irregular border, or itches, bleeds or crusts should be examined by a doctor before anything is done to it.
Laser options
Q-switched and picosecond laser for café au lait spots
Café au lait pigment sits mainly in the outer layer of the skin, so it is treated with pigment lasers that fire very short pulses: Q-switched (nanosecond) lasers at 532 nm, 755 nm or low-fluence 1064 nm, and picosecond lasers. Treatment is usually a series of sessions spaced weeks to months apart.
Head-to-head trials in Chinese patients have not shown one laser to be clearly superior. In a randomised split-lesion trial of 41 patients, 755 nm picosecond, 755 nm Q-switched and 532 nm Q-switched lasers were equally effective, with fewer side effects on the picosecond side. In a randomised trial of 40 children, low-fluence 1064 nm Q-switched and 532 nm Q-switched lasers cleared spots similarly, while 1064 nm caused less pain and fewer side effects. A 2023 meta-analysis found the Q-switched 1064 nm subgroup had the highest share of patients reaching more than 75% clearance and the lowest rates of darkening and lightening.
| Laser | What studies found | Watch-outs |
|---|---|---|
| Q-switched 532 nm | Effective for superficial pigment; similar clearance to other lasers in trials | More pain and side effects than low-fluence 1064 nm in one trial of children |
| Q-switched 755 nm | Similar clearance to 532 nm and 755 nm picosecond | Darkening and lightening reported; resolved within 12 months in one trial |
| Low-fluence Q-switched 1064 nm | Comparable clearance with less pain; strongest subgroup in a meta-analysis | Needs more, gentler sessions |
| Picosecond (755 nm and others) | Similar clearance to Q-switched; fewer side effects in one split-lesion trial | Evidence still limited; recurrence still possible |
Honest results
Clearance, recurrence, and which spots respond
A 2023 meta-analysis of 19 studies with 991 patients found that 75% of patients reached at least 50% clearance and 43% reached at least 75%. Recurrence averaged about 13%, with a wide range between studies, and the quality of evidence was rated very low to moderate. In the split-lesion trial above, 5 of 19 patients saw the spot return one to five months after treatment.
The shape of the edge predicts response. In a US series of 45 patients, spots with jagged or ill-defined borders (the 'coast of Maine' type) averaged an excellent response, in the 76 to 100% clearance band, while smooth, well-defined spots (the 'coast of California' type) averaged only a fair response, in the 26 to 50% band. A trial in Chinese children similarly found that small, brown, irregular-edged spots did better than larger, lighter, smooth-edged ones.
So laser can lighten many café au lait spots, sometimes a lot, but it cannot promise complete or permanent clearance. Some spots barely change, and some return after clearing.
Asian skin
PIH risk, and why a test patch comes first
Any pigment laser can leave temporary darkening (post-inflammatory hyperpigmentation, PIH) or lightening, and Asian skin is more prone to PIH. Pooled rates in the meta-analysis were low, about 1% each, but one trial in Chinese patients reported both darkening and lightening that took up to a year to fade, and its authors recommended test patches before treatment.
A test patch means treating a small part of the spot and waiting, often several weeks, to see whether it lightens, darkens or comes back before treating the rest. It is the most practical way to judge how your skin and that particular spot will respond.
- Have the spot diagnosed first; café au lait spots, sun spots and melasma need different settings.
- Expect a test patch and conservative settings at the first session.
- Do not have laser while tanned; treatment is usually deferred.
- Use broad-spectrum sunscreen and shade daily; Singapore's UV is high all year.
- Report any new darkening or pale patches between sessions so the plan can be adjusted.
Other options
Leaving it, covering it, or reaching for creams
Café au lait spots do not need treatment for health reasons, and many people simply leave them. Colour-correcting concealer or camouflage make-up can hide a spot on a visible area, and daily sunscreen stops it darkening further in the sun.
Brightening facials and over-the-counter lightening creams have not been shown to fade café au lait spots. Be wary of creams bought online or without clear ingredients, and never apply anything strong to a young child's skin without a doctor's advice.
Where to go
Laser for café au lait spots in our network
Pigment lasers are medical treatments. At IN Eternity Clinic, 9 Scotts Road, #12-01 Pacific Plaza, beside Orchard MRT, Dr Sin Yong performs Pico Laser (T2 Frax Radiance) on a platform with a 785 nm picosecond output and 532 nm and 1064 nm nanosecond (Q-switched) outputs, and Laser Toning with a 1064 nm Q-switched Nd:YAG. He examines the spot first and decides whether either suits it, usually starting with a test patch. Treatment is priced at consultation by the clinic; WhatsApp +65 8815 3008, Monday to Saturday, 11am to 8pm.
SkinRev Lab, at CityLink Mall #B1-28 by City Hall MRT, is a non-invasive centre and does not perform lasers; its facials do not fade café au lait spots. For a child with several spots, start with a GP, paediatrician or dermatologist; a cosmetic laser decision is separate and can wait.
Sources
References & sources
- Legius E, Messiaen L, Wolkenstein P, et al. Revised diagnostic criteria for neurofibromatosis type 1 and Legius syndrome: an international consensus recommendation. Genet Med. 2021;23(8):1506-1513.
- Children's Tumor Foundation. Café-au-lait spots (CALS) fact sheet. 2022.
- Cleveland Clinic. Café au lait spots. Last reviewed 31 March 2022.
- Guo ZZ, Wang ZC, Wang D, et al. Laser treatment for cafe-au-lait macules: a systematic review and meta-analysis. Eur J Med Res. 2023;28(1):185.
- Belkin DA, Neckman JP, Jeon H, Friedman P, Geronemus RG. Response to laser treatment of café au lait macules based on morphologic features. JAMA Dermatol. 2017;153(11):1158-1161.
- Cen Q, Gu Y, Luo L, et al. Comparative effectiveness of 755-nm picosecond laser, 755- and 532-nm nanosecond lasers for treatment of café-au-lait macules (CALMs): a randomized, split-lesion clinical trial. Lasers Surg Med. 2021;53(4):435-442.
- Zhuang Y, Huang M, Shen J, et al. Comparison of the efficacy and safety between a low-fluence 1064-nm Q-switched Nd:YAG laser and a conventional Q-switched 532-nm laser for the treatment of cafe-au-lait macules in 40 Chinese children. Lasers Med Sci. 2022;37(1):279-286.
Common questions
Your questions,
answered
Are café au lait spots dangerous?
No. They are benign birthmarks and do not turn into cancer. What matters is the number: six or more spots larger than 5 mm in a child before puberty is one sign of neurofibromatosis type 1, so several spots should be checked by a doctor.
How many café au lait spots are normal?
About one in ten people has one or two, and that is usually all. Six or more spots larger than 5 mm before puberty, or larger than 15 mm after puberty, is one of the NF1 criteria and needs a doctor's assessment, especially alongside freckles in the armpits or groin.
Do café au lait spots mean neurofibromatosis?
Not on their own. One or two spots are common in healthy people. NF1 is diagnosed when two or more criteria are present, such as six or more spots plus skin-fold freckling, or one criterion in a child whose parent has NF1. Spots and freckles alone can also come from Legius syndrome.
Can café au lait spots be removed?
They can often be lightened with Q-switched or picosecond lasers, but results vary widely. In pooled studies about three in four people reached at least 50% clearance, fewer reached near-complete clearance, and some spots returned. A test patch is usually done first.
Do café au lait spots come back after laser?
Sometimes. Recurrence averaged about 13% in a meta-analysis, and in one trial 5 of 19 patients saw a spot return within one to five months. Sun protection between and after sessions helps, but no laser can promise a spot will stay away.
Is pico or Q-switched laser better for café au lait spots?
Trials have not shown a clear winner. In one randomised trial, 755 nm picosecond and Q-switched lasers cleared spots equally, with fewer side effects from picosecond. Low-fluence 1064 nm Q-switched laser has also performed well with less pain. The doctor chooses after examining the spot and doing a test patch.
Do café au lait spots fade or grow?
They usually last for life and grow in proportion as a child grows. They can look darker after sun exposure. Spots that keep increasing in number in a young child should be shown to a doctor.
Can you get café au lait spots as an adult?
Most are present from birth or early childhood, though some adults only notice them later. A new brown patch in adulthood may be a sun spot, naevus spilus, Becker's naevus or melasma instead, so have it examined before treatment.
How much does café au lait laser cost in Singapore?
It depends on the size of the spot, the laser used and the number of sessions. At IN Eternity Clinic, Pico Laser and Laser Toning are priced at consultation by the clinic, after Dr Sin Yong has examined the spot. Ask about the whole course, including the test patch.