Keratosis Pilaris: Causes, Care and Realistic Expectations

Most people with keratosis pilaris (KP) have already tried the obvious fix: scrubbing harder. It rarely works, and the reason says a lot about the condition. The bumps aren’t dirt or dead skin sitting on the surface. They are tiny plugs lodged inside the follicle opening, and they form again as long as the underlying tendency is there.

This guide covers what is actually happening in the skin, who gets KP and why, how it looks on different skin tones, what the clinical evidence says about the ingredients you’ll see on labels, and what a realistic result looks like.

What is keratosis pilaris?

Keratosis pilaris is a dry-skin condition caused by keratin building up in hair follicles. Keratin is the tough protein that forms the outer layer of your skin, along with your hair and nails. Normally the lining of the follicle sheds its cells in step with the rest of the skin. In KP, that process goes slightly wrong: according to DermNet, the upper part of the follicle keratinizes abnormally, so keratin fills the opening instead of flaking away.

The result is a small, firm plug. A 2025 review in the Indian Journal of Dermatology describes these plugs as sticky layers of keratin that widen the top of the follicle and frequently trap one or more coiled, brittle hairs. That trapped hair is why some KP bumps look like they have a tiny dark dot or curl inside.

On touch, the skin feels like fine sandpaper. On sight, it can resemble permanent goose bumps, which is where the nickname “chicken skin” comes from. Cleveland Clinic notes that many dermatologists consider KP a skin type rather than a disease. It is not contagious, it is not an infection, and it does not scar unless the bumps are picked or scratched.

Who gets keratosis pilaris, and why

KP is one of the most common things dermatologists see. DermNet estimates it affects 50 to 70% of teenagers and about 40% of adults. It typically appears in childhood and becomes more noticeable during the teenage years, often worsening around puberty.

Genetics

KP runs in families. DermNet and the 2025 review both describe a suspected autosomal dominant pattern of inheritance, which means a single copy of the relevant gene variant from one parent can be enough. If a parent or sibling has rough bumps on their upper arms, your odds are higher.

The skin barrier connection

Researchers have linked KP to mutations in filaggrin, which DermNet describes as a key protein in skin barrier function. That link helps explain why KP so often shows up alongside other dry-skin conditions. DermNet lists atopic eczema and ichthyosis (an inherited cause of very dry, scaly skin) as associated conditions.

Other associations

Cleveland Clinic lists several factors that raise the likelihood of KP, including a family history, eczema, ichthyosis vulgaris, asthma, obesity and diabetes, along with less common conditions such as hypothyroidism, Cushing’s syndrome and Down syndrome. None of these means KP is a sign of something serious. For most people, it is simply the way their follicles behave.

What KP looks like on different skin tones

KP bumps are small, usually pinpoint to pinhead size, and clustered. Their color depends on your skin tone and on how much inflammation is around each follicle.

The NHS notes that on lighter skin the bumps often look red or pink, with rough, dry patches. On brown and Black skin, they are often the same color as the surrounding skin, and DermNet adds that they may appear brown or black. Cleveland Clinic describes the full range as skin-colored, red, white, brown, dark brown or black. On deeper skin tones, the dark spots that linger around follicles can be more bothersome than the texture itself.

Variants you may hear about

Several named forms exist. The 2025 review describes keratosis pilaris alba (pale, non-inflamed bumps, the most common type) and keratosis pilaris rubra (with prominent redness). DermNet also describes ulerythema ophryogenes, which involves the eyebrows and can cause eyebrow hair loss, and atrophoderma vermiculatum, which leaves small pitted areas on the cheeks. These rarer variants can cause permanent changes and belong in a dermatologist’s office, not a home routine.

Where it appears and why it changes with the seasons

The upper arms are the classic site. One study cited in the 2025 review found KP on the upper arms in 92% of affected people, on the thighs in 59% and on the buttocks in 30%. It can also appear on the forearms, back, chest, cheeks and lower legs. It never appears on the palms or soles, because those areas have no hair follicles.

KP has a clear seasonal rhythm. Cleveland Clinic notes that dry air and winter months make it look worse, and the 2025 review reports that many people improve in summer, when humidity is higher. If your arms feel smoother in July than in January, that is not your imagination, and it is a useful clue: anything that keeps the skin hydrated tends to help.

On the legs, KP is one of several causes of the dotted look often called strawberry legs. Bumps that are tender, pus-filled or itchy in a new way may be something else, such as folliculitis, which is an inflammation or infection of the follicle and is handled differently.

How keratosis pilaris is diagnosed

There is no blood test or scan for KP. According to the AAD, a dermatologist diagnoses it by looking closely at the affected skin, and the pattern is usually distinctive: small, rough, evenly spaced bumps centered on hair follicles, concentrated on the backs of the upper arms and the fronts of the thighs, often in someone with generally dry skin or a family history.

Where a dermatologist earns their fee is in ruling out the look-alikes. DermNet’s list of conditions that can resemble KP includes atopic dermatitis, folliculitis, milia, lichen nitidus, lichen spinulosus and phrynoderma. Some of those need entirely different care. A few questions usually help sort it out: Did the bumps start in childhood? Do they itch, sting or hurt? Are there pustules? Do they come and go with the seasons? Bring photos if your skin looks different in winter than on the day of your appointment.

What the evidence says about keratosis pilaris ingredients

The American Academy of Dermatology (AAD) groups KP treatments into two jobs: moisturizers that ease dryness and exfoliating ingredients that loosen the plugs. Many products do both. The AAD lists alpha hydroxy acids (glycolic and lactic acid), salicylic acid, urea and retinoids as exfoliating options.

The research behind these ingredients is real but modest. A 2025 literature review in Cureus concluded that topical keratolytics remain the cornerstone of KP care, while noting that the studies are small, use different outcome measures and rarely follow people for long. Here is what the better-known trials found.

Ingredient	What was studied	What it found	Caveats
Lactic acid 10%	Split-body trial, 50 people, twice daily on one arm for 12 weeks	66% average reduction in lesions	More reports of mild stinging and odor than salicylic acid
Salicylic acid 5%	Same trial, applied to the opposite arm	52% average reduction in lesions	Slightly better tolerated; less effective than lactic acid in this trial
Urea 20%	Open-label study, 30 adults, once daily for 4 weeks	Smoother, softer texture from week 1, sustained at week 4	No comparison group; several authors employed by a skincare company
Glycolic acid peels (50 to 70%)	In-office peels repeated over about 80 days	Improved roughness and follicular dark spots	No difference at five-year follow-up, so gains need upkeep
Topical retinoids	Listed by the AAD as an option	Can reduce plugging	A 2025 review describes them as giving only modest improvement

Lactic acid and salicylic acid

The most cited head-to-head comparison is a 2015 randomized, split-body trial from Bangkok. Fifty participants applied 10% lactic acid cream to one upper arm and 5% salicylic acid cream to the other, twice a day for 12 weeks. Lesions fell by an average of 66% on the lactic acid side and 52% on the salicylic acid side, and both arms stayed improved at a check four weeks after treatment ended. Side effects were limited to mild burning or itching, slightly more often with lactic acid.

Urea

The AAD lists urea both as a moisturizing ingredient and as an exfoliating one. In a 2024 study in the Journal of Drugs in Dermatology, 30 adults with KP on the arms or legs applied a 20% urea cream once daily. Skin smoothness and texture improved significantly after one week and stayed improved at four weeks, with no significant adverse events. The study had no control group, and several authors were employees of Galderma Laboratories, a skincare company, so it is encouraging rather than definitive. We cover concentrations and use in detail in our guide to urea for keratosis pilaris.

Prescription and in-office options

For persistent or very red KP, the AAD notes that a dermatologist may suggest a short course of a corticosteroid cream to calm redness and soften bumps, a prescription retinoid, or laser and light treatments to reduce redness and discoloration. DermNet lists pulsed dye laser and intense pulsed light for redness, and laser hair removal where ingrown hairs are part of the picture. These are decisions to make with a clinician who has examined your skin.

A realistic at-home routine for keratosis pilaris

The AAD’s self-care advice boils down to three steps: exfoliate gently, use a product with an exfoliating ingredient, then moisturize. Built into a week, that looks like this.

In the shower

Keep it short and warm, not hot. The AAD recommends baths or showers of 20 minutes or less with warm water and no more than one a day. Skip bar soap, which tends to dry the skin, and choose a gentle, fragrance-free cleanser, as the NHS also advises. If you like a physical step, the AAD’s guidance is to use a soft loofah, buff puff or washcloth with light pressure, not to scrub.

Right after

Moisturize within five minutes of getting out, while the skin is still damp. The AAD suggests thick creams or ointments, ideally containing urea or lactic acid, and applying moisturizer two or three times a day where KP is active.

Daily or most days

Apply one exfoliating product, such as a lactic acid, salicylic acid or urea lotion, to the affected areas. Starting with a single active makes it easier to tell what your skin tolerates, and the AAD advises pausing for a few days if your skin becomes dry or irritated.

Reading a label

Product names are not a reliable guide, so look at the ingredient list. The AAD recommends creams or ointments rather than thin lotions for KP. Look for urea, lactic acid (sometimes listed as ammonium lactate, which Cleveland Clinic names as a common over-the-counter option), glycolic acid or salicylic acid. The percentage is often printed on the front for urea and lactic acid products. Fragrance adds nothing for KP and is one more possible irritant, which is why the NHS suggests fragrance-free products.

Around the house

Run a humidifier when the air feels dry, especially in winter. The AAD also points out that self-tanners tend to settle into the follicles and make bumps more visible.

This is where a Korean skincare mindset is genuinely useful: steady, low-intensity care every day beats an aggressive session once a week. KP responds to consistency, not force.

What tends to make KP worse

Some habits reliably work against you. The AAD warns that scrubbing irritates the skin and tends to worsen KP, and the NHS lists harsh scrubbing, hot water, perfumed soaps and picking or scratching among the things to avoid. Picking deserves special mention: Cleveland Clinic notes that KP itself doesn’t scar, but picked or scratched bumps can. Our explainer on why scrubbing makes KP worse covers the mechanism and the gentler alternatives.

Hair removal can also aggravate the area. The AAD suggests that people with KP consider laser hair removal instead of shaving or waxing, since both can irritate follicles that are already plugged.

Realistic expectations: how long results take

This is the part most product labels skip. KP can be improved and managed, but not cured. The AAD states plainly that treatment cannot cure keratosis pilaris and that results require ongoing care.

The first month

Both the AAD and Cleveland Clinic say to expect visible improvement within four to six weeks of following a plan consistently. In the urea study above, texture changes were measurable after just one week, but the bumps themselves take longer to flatten.

The long run

Improvement fades when you stop. The glycolic peel research summarized in the 2025 Cureus review is a good illustration: people looked better during treatment, but at five years there was no measurable difference. Think of KP care the way you think of moisturizing dry hands, as maintenance rather than a one-time fix.

With age

The good news is that time is on your side. DermNet notes that KP often clears up during adult life, and the AAD describes clearing that happens gradually over many years. Cleveland Clinic says it usually fades by around age 30, though many adults still have some.

When to see a dermatologist

KP is harmless, so seeing a doctor is about comfort, confidence and getting the diagnosis right. Several conditions can look similar, including eczema, folliculitis and, rarely, a vitamin A deficiency called phrynoderma, which DermNet lists among the look-alikes.

A board-certified dermatologist can confirm the diagnosis by looking closely at the skin and can offer prescription or in-office options that aren’t available over the counter. For a fuller list of warning signs across all types of skin bumps, see our red-flag checklist.

Frequently asked questions

Is keratosis pilaris contagious?

No. Keratosis pilaris is a buildup of keratin in the follicles, not an infection, so it can’t spread from person to person or from one part of your body to another by touch.

Does keratosis pilaris ever go away on its own?

Often it does, slowly. DermNet notes that KP frequently clears during adult life, and Cleveland Clinic says it usually fades by about age 30. Many adults still have some bumps, especially in winter, and regular care keeps them less noticeable.

Can I squeeze or pop KP bumps?

It’s better not to. The NHS lists picking and scratching among the things to avoid, and while KP itself doesn’t scar, Cleveland Clinic notes that picked or scratched bumps can. A daily exfoliating lotion loosens the plugs more safely.

What is the best lotion for keratosis pilaris?

There is no single best product, but the ingredients with the most evidence are lactic acid, salicylic acid and urea. In the largest comparison trial, 10% lactic acid reduced lesions by 66% and 5% salicylic acid by 52% over 12 weeks. Pick one you tolerate well and use it consistently.

Is keratosis pilaris caused by diet or a vitamin deficiency?

For almost everyone, KP is genetic and tied to dry skin, not diet. Cleveland Clinic mentions a possible link to vitamin A deficiency, and a rare deficiency-related condition called phrynoderma can look similar, which is one reason a dermatologist may ask about your diet if the picture is unusual.

Does shaving make keratosis pilaris worse?

It can. Shaving and waxing irritate follicles that are already plugged, and the AAD suggests people with KP consider laser hair removal instead.

Sources

1. American Academy of Dermatology. “Keratosis pilaris: Diagnosis and treatment.” AAD.org. source
2. American Academy of Dermatology. “Keratosis pilaris: Self-care.” AAD.org. source
3. Cleveland Clinic. “Keratosis Pilaris.” Cleveland Clinic Health Library. source
4. DermNet. “Keratosis pilaris.” DermNet. source
5. NHS. “Keratosis pilaris.” NHS.uk. source
6. Kaur K, Kaur A, Kalsi V, Kasav S. “Keratosis Pilaris Unveiled: Insights into its Origin, Management Strategies and Research Frontiers.” Indian Journal of Dermatology, 2025. source
7. Kootiratrakarn T, Kampirapap K, Chunhasewee C. “Epidermal Permeability Barrier in the Treatment of Keratosis Pilaris.” Dermatology Research and Practice, 2015. source
8. McCormick et al. “Evaluation of a Moisturizing Cream with 20% Urea for Keratosis Pilaris.” Journal of Drugs in Dermatology, 2024. source
9. Dampa E. “The Effectiveness of Topical Keratolytics (Alpha Hydroxy Acids/Beta Hydroxy Acids/Urea) in Treating Keratosis Pilaris: A Review of the Literature.” Cureus, 2025. source

This article is for general information and isn’t a substitute for professional medical advice, diagnosis or treatment.