Those small, rough bumps on your arms are almost certainly keratosis pilaris, a harmless skin condition where tiny plugs of keratin build up inside hair follicles. About 40% of adults have it. The bumps feel like sandpaper, look like permanent gooseflesh, and tend to cluster on the backs of the upper arms, though they can also appear on thighs, cheeks, and buttocks. You can’t cure keratosis pilaris, but the right routine can make the bumps much less noticeable.
What’s Actually Causing the Bumps
Your skin constantly sheds dead cells. In keratosis pilaris, a protein called keratin accumulates in the openings of individual hair follicles instead of shedding normally. Each tiny plug creates a raised bump about 1 mm across, and because every follicle on the affected area does the same thing, the bumps look uniform and evenly spaced. They don’t hurt, rarely itch, and aren’t caused by infection or poor hygiene.
The condition tends to run in families and often shows up alongside eczema. Dry air and cold weather make it worse, which is why your arms may look rougher in winter and smoother in summer. It’s most common in children and teenagers and often fades with age, though many adults keep it indefinitely.
Make Sure It’s Not Something Else
Keratosis pilaris is easy to confuse with other conditions at a glance, but the differences are straightforward. KP bumps are all the same size, symmetrically distributed on both arms, and filled with dry keratin rather than pus. Folliculitis, by contrast, produces red or pus-filled bumps that vary in size, appear in irregular clusters, and may be tender. Acne on the arms or chest shows a mix of blackheads, whiteheads, and inflamed bumps in different stages, often concentrated on the chest, back, or shoulders rather than the outer upper arms.
If your bumps are painful, contain fluid, or appeared suddenly, they’re likely not keratosis pilaris and worth having a dermatologist look at.
The Two Steps That Actually Work
Treating keratosis pilaris comes down to two things: dissolving the keratin plugs and keeping the skin moisturized so new plugs are less likely to form. Think of it as exfoliate, then repair.
Chemical Exfoliants
Chemical exfoliants are more effective than scrubbing for this condition because they dissolve the keratin inside the follicle rather than just buffing the surface. The ingredients with the strongest evidence are:
- Urea cream (20%): Softens and dissolves keratin plugs. This concentration is available over the counter in many body creams marketed for rough or dry skin.
- Salicylic acid lotion (6%): Penetrates into the follicle to break up the plug. Look for body-specific formulations, since facial salicylic acid products are usually only 2%.
- Glycolic acid: Works at the skin’s surface to speed cell turnover. Over-the-counter body lotions typically contain 10 to 15% glycolic acid, which is a good starting point.
- Lactic acid: A gentler option that also hydrates. Widely available in body lotions at concentrations around 10 to 12%.
You don’t need all of these. Pick one exfoliating product and use it consistently. Apply it to damp skin after a shower, when absorption is best. If your skin feels tight, stings, or gets red, you’ve gone too strong or too frequent. Scale back to every other day until your skin adjusts.
Moisturize Immediately After
Exfoliation without moisture makes things worse. Once you’ve applied your treatment product (or on days you skip it), layer a rich moisturizer on top. Creams and ointments work better than thin lotions. Ingredients like ceramides, linoleic acid, and oat-based oils help rebuild the skin’s protective barrier, reduce dryness, and calm low-level inflammation. A recent clinical study found that pairing gentle physical exfoliation with a plant-oil moisturizer containing oat kernel oil and rice bran oil significantly improved both the texture and appearance of keratosis pilaris by strengthening that barrier.
How Long Before You See Results
This is where most people give up too early. The American Academy of Dermatology recommends sticking with your routine for at least four to six weeks before judging whether it’s working. Keratin plugs take time to dissolve, and the skin underneath needs to go through several turnover cycles before the texture smooths out. You’ll likely notice the sandpaper feeling improving before the redness fades.
Keratosis pilaris also comes back when you stop treating it. The goal isn’t a one-time fix but a low-effort maintenance routine. Once your skin smooths out, you can often reduce your exfoliating product to a few times a week while keeping up daily moisturizing.
A Simple Daily Routine
You don’t need a complicated regimen. Here’s what a practical routine looks like:
- In the shower: Use lukewarm water (hot water strips moisture from the skin). You can use a gentle physical scrub once or twice a week, massaging for 20 to 30 seconds, but don’t rely on this as your primary treatment.
- Right after toweling off: Apply your chemical exfoliant (urea cream, salicylic acid lotion, or glycolic/lactic acid lotion) to damp skin on the affected areas.
- Follow with moisturizer: If your exfoliant product isn’t already hydrating, layer a ceramide or oil-based cream on top.
- Before bed on non-exfoliant nights: Just moisturize.
That’s it. Consistency matters far more than intensity.
When Over-the-Counter Products Aren’t Enough
If you’ve been diligent for six weeks and the bumps haven’t budged, a dermatologist can prescribe a topical retinoid. Retinoids speed up the rate at which skin cells turn over and shed, which helps prevent keratin from accumulating in the follicle in the first place. They’re more potent than over-the-counter options, but they can also cause dryness and irritation, so they’re typically reserved for stubborn cases.
In-office chemical peels using high-concentration glycolic acid (50 to 70%) have also shown improvement in keratosis pilaris. These are applied for five to seven minutes under supervision and repeated over several sessions. They’re not necessary for most people, but they’re an option if you want faster results on a specific area.
Habits That Make It Worse
A few common habits can undo your progress. Picking or squeezing the bumps damages the follicle, causes redness, and can lead to scarring or dark spots, especially on deeper skin tones. Long, hot showers strip the skin’s natural oils and worsen dryness. Skipping moisturizer in summer because your skin “feels fine” lets keratin plugs rebuild. And harsh bar soaps or alcohol-based body products can compromise the skin barrier you’re trying to protect.
If you live in a dry climate or spend winters in heated indoor air, consider running a humidifier in your bedroom. Keeping ambient moisture higher reduces the rate at which your skin dries out overnight, which gives your treatment products a better chance to work.