Rough little bumps on the backs of your arms that never quite go away. Maybe your thighs too. They don't hurt. They aren't spots. Moisturizing sort of helps, but never finishes the job.
That's keratosis pilaris. The first useful thing to know is how ordinary it is — the NHS calls it "a very common harmless condition." It isn't a hygiene problem. It isn't something you did. And it isn't infectious, so you can't spread it or catch it.
What it actually is
Keratin is blocking your hair follicles.
The NHS puts the mechanism simply: "Hair follicles become blocked with a build-up of keratin, a substance found in skin, hair and nails." The AAD says the same thing from the other direction — "we get keratosis pilaris when dead skin cells clog our pores," and "when dead skin cells clog many hair follicles, you feel the rough, dry patches."
So each bump is a follicle with a plug in it. Multiply that across your arm and you get the texture people call sandpaper, chicken skin or a nutmeg grater.
Nobody fully knows why the keratin builds up. The NHS says so directly. What we do know is that it runs in families, so you probably got it from a parent.
What it looks like, including on deeper skin tones
Small, painless bumps, and the color depends on your skin.
Per the NHS, they're "usually skin-colored but can be red (on white skin) or darker (on brown or black skin)." They turn up most often on the arms, thighs or bottom. The skin can feel itchy. Most people find it improves in summer and worsens in winter.
That seasonal pattern is one of the most reliable ways to tell KP from other bumpy-skin conditions.
Who gets it
Almost anyone, and usually early.
The AAD is clear that "people of all ages and races have this common skin condition." It typically starts before age 2 or during the teenage years, and women are a bit more likely to have it.
The AAD's listed risk factors:
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A family history of it. The strongest single signal.
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Dry skin.
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Eczema.
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Asthma or hay fever.
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Ichthyosis vulgaris.
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Excess body weight.
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Taking vemurafenib, a melanoma medication.
So if you've got eczema or hay fever and rough upper arms, that isn't a coincidence. It's a well-documented combination.
Keratosis pilaris is one cause of strawberry legs
Strawberry legs is a look, not a diagnosis. Keratosis pilaris is one of four things that cause it, and it’s the only one of the four that’s genetic.
The other three — ingrown hairs, folliculitis and plain dry skin — all behave differently and respond to different things. If you've been treating rough, dry, skin-colored bumps with ingrown-hair advice, that's likely why it hasn't worked. We've written about what causes strawberry legs separately, including how to work out which one you're actually looking at.
The quick version: KP is rough to the touch and not tender. Ingrowns and folliculitis are tender. Texture is the tell.
Keratosis pilaris compared with what it's mistaken for
|
What changes |
Keratosis pilaris |
Ingrown hairs |
Folliculitis |
|---|---|---|---|
|
Feels like |
Rough and dry, not tender |
Tender when pressed |
Sore, sometimes warm |
|
Looks like |
Small bumps, skin-colored, or red on white skin and darker on brown or black skin |
Raised, often with a visible hair loop |
Red and inflamed, sometimes a white head |
|
Where |
Upper arms, thighs, bottom |
Anywhere you shave or wax |
Anywhere you shave or wax |
|
Caused by |
Keratin blocking the follicle |
A cut hair growing back into the skin |
Follicles inflamed or infected |
|
Linked to shaving |
No |
Yes |
Yes |
|
Seasonal |
Better in summer, worse in winter |
No pattern |
No pattern |
|
Goes away |
Often fades over years. Cannot be cured |
Resolves over days |
Needs a doctor if it spreads |
What actually helps
Moisturizer, consistently, for longer than you think.
Moisturize on damp skin. The AAD recommends applying "within 5 minutes of getting out of the bath or shower, while your skin is still damp," at least two to three times a day. Creams and ointments work better than lotions here. Look for urea or lactic acid on the label — the AAD names both.
Exfoliate gently, not aggressively. The AAD describes gentle removal of dead skin with a loofah. The NHS says to exfoliate gently with a washcloth. Neither recommends a harsh scrub.
Keep showers cool or lukewarm. Hot water strips the skin, and KP is worse on dry skin.
Use mild, unperfumed soaps.
Give it four to six weeks. The AAD's benchmark: "If you fail to see improvement after following your treatment plan for 4 to 6 weeks, tell your dermatologist." This isn't a condition that responds in a weekend.
Stronger options exist, through a doctor. Prescription preparations containing alpha hydroxy acid, glycolic acid, lactic acid, salicylic acid, urea or retinoids. A corticosteroid can soften bumps and reduce redness. Laser and light treatments can reduce swelling, redness and discoloration.
Where Flamingo Fits In
Nothing here is a KP treatment, but what we make can help with the part that sits next to it: shaving skin that's already dry and rough without making it angrier.
The Nourishing Shave Oil and the Foaming Shave Gel, which applies directly to wet skin and smooths over the shaving area, both provide a cushion between skin and the razor. The Daily Moisturizing Lotion goes on damp skin to lock in long lasting moisture, which is the timing the AAD recommends for dry skin generally.
FAQ
What is keratosis pilaris?
A very common, harmless condition where keratin blocks hair follicles, producing small rough bumps, usually on the arms, thighs and bottom.
What causes keratosis pilaris?
A build-up of keratin blocking the follicle. Why the build-up happens isn't fully known, but it runs in families.
Is keratosis pilaris the same as strawberry legs?
It's one cause of it. Strawberry legs describes a look, and KP is one of four conditions that can produce it, alongside ingrown hairs, folliculitis and dry skin. It's the only genetic one.
Can keratosis pilaris be cured?
No. The AAD states that treatment cannot cure it. It can be managed, and it often fades on its own over years.
Does shaving cause keratosis pilaris?
No. It's keratin blocking the follicle from within, which shaving doesn't affect. Shaving can irritate skin that already has it.
Will a different razor help my keratosis pilaris?
No razor changes KP. A comfortable shave on dry, rough skin is still worth getting right, but that's about irritation, not the condition.
Why is it worse in winter?
KP typically improves in summer and worsens in winter, which tracks with how dry your skin is.
What should I look for in a moisturizer?
The AAD names urea and lactic acid. Creams and ointments generally work better than lotions, applied within five minutes of a shower while the skin is still damp.
How long before I see a difference?
Give it four to six weeks. If there's no improvement by then, the AAD's advice is to tell your dermatologist.
Is keratosis pilaris contagious?
No. The NHS states it is not infectious and cannot be spread or caught.
Still Have Questions?
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Sources
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NHS, "Keratosis pilaris." https://www.nhs.uk/conditions/keratosis-pilaris/ — read 2026-09-23
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American Academy of Dermatology, "Keratosis pilaris: Causes." https://www.aad.org/public/diseases/a-z/keratosis-pilaris-causes — read 2026-09-23
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American Academy of Dermatology, "Keratosis pilaris: Diagnosis and treatment." https://www.aad.org/public/diseases/a-z/keratosis-pilaris-treatment — read 2026-09-23
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UPMC, "Strawberry Legs: Causes, Treatments, and Recovery." https://upmc.it/en/conditions/strawberry-legs — read 2026-09-23
This content isn't meant to replace the advice of a medical professional. If irritation is a constant struggle for you, we recommend chatting with a dermatologist or your doctor.