Those Little Bumps on Your Arms May Be Keratosis Pilaris

You know those tiny bumps on the backs of your upper arms that never seem to completely go away? They may be skin-colored, pink, red, or slightly darker than the surrounding skin. When you run your hand over them, the area can feel almost like fine sandpaper. Maybe you’ve spent years assuming they were clogged pores, body acne, ingrown hairs, or simply skin that needed a much more enthusiastic scrub.

There’s a good chance those bumps may actually be keratosis pilaris, often shortened to KP. It’s an extremely common and harmless skin condition, and it frequently appears on the upper arms, thighs, and buttocks. The frustrating part is that many of the things we instinctively do to make bumpy skin smoother—scrubbing harder, picking at the bumps, taking long hot showers—can leave the skin more irritated and make the texture look even more noticeable.

If you’ve been trying to scrub those bumps into submission for years, understanding what’s actually happening inside the hair follicle can completely change the way you care for them.

What Is Keratosis Pilaris?

Keratosis pilaris happens when dead skin cells accumulate and plug the openings of hair follicles. Mayo Clinic describes the condition as a buildup of keratin that forms scaly plugs in the follicles, creating those characteristic patches of tiny, rough bumps. It isn’t contagious, it isn’t caused by poor hygiene, and it isn’t the same thing as acne—even though the bumps can sometimes look surprisingly similar.

That last distinction matters because acne and KP call for different thinking. Acne involves a more complicated process that can include excess sebum, follicular plugging, bacteria, and inflammation. With keratosis pilaris, what you’re usually feeling is a collection of tiny plugged follicles surrounded by skin that is often quite dry. That’s why the classic texture is less like an inflamed pimple and more like permanent goosebumps or fine sandpaper.

KP can occur at any age, although it commonly begins during childhood or adolescence and may become less noticeable as people get older. It also tends to run in families and is more common in people who have dry skin or certain conditions such as atopic dermatitis. Some adults continue to have it well beyond their twenties, so if you’re 45 and still staring at the same bumps you had at 16, you are certainly not the only one.

Why Keratosis Pilaris Can Look Worse in Dry Weather

This is particularly relevant for those of us living in Colorado. Dry skin tends to make keratosis pilaris more noticeable, and the American Academy of Dermatology specifically notes that KP may worsen during winter or in a dry climate. Some people notice their bumps become less obvious during humid summer months and return as soon as the air becomes cold and dry.

That relationship makes sense when you think about the texture of the skin around those plugged follicles. If the surrounding skin is already dry, rough, and flaky, the bumps become more obvious both visually and when you run your hand across them. Add hot showers, indoor heating, cold wind, and clothing rubbing against the upper arms, and suddenly an area that was mildly bumpy in August can feel considerably rougher by January.

This is also why I don’t approach KP as simply a problem of “not exfoliating enough.” Yes, managing excess surface buildup can help. But if you exfoliate aggressively while ignoring dryness, you may end up trading small bumps for small bumps surrounded by red, irritated, uncomfortable skin.

Why Scrubbing Harder Usually Isn't the Answer

When skin feels rough, the natural response is to scrub it until it feels smooth. Unfortunately, KP does not reward aggression. The American Academy of Dermatology recommends gentle exfoliation and specifically cautions against scrubbing, which can irritate the skin and worsen keratosis pilaris. Mayo Clinic gives similar advice: vigorous scrubbing or trying to physically remove the plugs can irritate the affected area.

This is where I want you to think differently about exfoliation. Your goal is not to remove every bump in one shower. You’re trying to gradually improve the way excess surface cells are being shed while keeping the surrounding skin comfortable. Those are very different goals, and the second one requires patience.

Picking at individual bumps isn’t particularly helpful either. It may temporarily remove a visible plug, but it can also create inflammation, scabbing, and discoloration that lasts far longer than the original bump. If your arms already have areas of redness or dark marks from picking, giving your skin a break from that cycle is one of the simplest things you can do.

Where AHAs Fit Into Keratosis Pilaris

This is one of the situations where alpha hydroxy acids can make a lot of sense. Dermatologists commonly use keratolytic ingredients—ingredients that help loosen excess dead skin buildup—to improve the texture of keratosis pilaris. Both the American Academy of Dermatology and Mayo Clinic include alpha hydroxy acids such as glycolic and lactic acid among the topical ingredients that may help smooth KP.

I like AHAs for this purpose because they allow us to approach roughness chemically rather than relying entirely on friction. Instead of repeatedly sanding at the surface with an aggressive body scrub, an AHA can help encourage the loosening and shedding of accumulated surface cells. That doesn’t mean acids should be used recklessly. Too much chemical exfoliation can leave skin raw, dry, and irritated just as surely as too much physical scrubbing can.

Frequency matters. Strength matters. The rest of your routine matters. If your arms begin to burn, sting, become very red, or feel increasingly dry, that is not a sign that you need to use more acid. Dermatologists recommend stopping exfoliating treatments temporarily if KP skin becomes dry or irritated.

Glycolic Acid or Lactic Acid for KP?

Both glycolic and lactic acid can be used in products intended to improve rough, bumpy skin, and neither is automatically the right choice for everyone. Glycolic acid is a smaller AHA and is often chosen when a more assertive exfoliating effect is wanted. Lactic acid tends to be approached as the gentler option and can be especially appealing when dryness is part of the picture.

But I wouldn’t choose a KP product based solely on which acid sounds stronger. As I explain whenever we talk about exfoliation, the finished formula matters. Concentration, pH, supporting ingredients, frequency of use, and what else you’re putting on your skin all affect how an AHA behaves. A modest amount used consistently can be far more useful than an aggressive treatment that leaves you so irritated you have to stop altogether.

My insider tip: if you’re treating KP, don’t judge your routine by how smooth your arms feel immediately after exfoliating. Judge it by how they look and feel several days later. Skin that feels temporarily polished but becomes red, tight, itchy, or flaky afterward was probably pushed too far.

Don't Forget the Moisturizing Half of the Equation

If exfoliation gets all the attention with KP, moisturizing is the quieter part of the routine that people often underestimate. Dryness tends to make keratosis pilaris more obvious, and dermatologists routinely recommend moisturizing as part of KP care. The American Academy of Dermatology advises applying moisturizer after bathing while the skin is still slightly damp, when you can help hold onto some of that water.

I particularly like this approach in a dry climate because it doesn’t require another complicated treatment. Finish your shower, gently pat your skin so it isn’t dripping but is still slightly damp, and apply your moisturizer promptly. Rather than vigorously rubbing the area, smooth or massage the moisturizer into the skin and give it a moment to settle before getting dressed.

A richer moisturizer can also make the skin around the bumps feel much softer, even though moisturizer itself isn’t magically removing every follicular plug. Our Unscented Body Butter is the Simple Body option I’d reach for when the bigger issue is dry, rough body skin and you want to add a richer moisturizing layer without synthetic fragrance.

A Simple Routine for Rough, Bumpy Arms

KP doesn’t need a ten-step routine. In fact, I think the more frustrated people become with texture, the more likely they are to overcomplicate it. Start by shortening very hot showers and cleansing the area gently rather than repeatedly scrubbing it. Then introduce exfoliation gradually if your skin tolerates it. An AHA product can help address surface buildup, but it doesn’t need to be used aggressively or combined with every other exfoliating product you own.

Afterward, moisturize consistently, especially while your skin is still slightly damp after bathing. If you live somewhere dry like Colorado, this part becomes even more important during winter and whenever indoor heating is running constantly. The goal is to create a rhythm your skin tolerates well enough to maintain—not a three-day attack on the bumps followed by two weeks of recovering from irritation.

Also pay attention to shaving and friction. The American Academy of Dermatology notes that shaving or waxing skin affected by KP can sometimes cause more bumps, while Mayo Clinic recommends protecting affected areas from friction caused by tight clothing. If your upper arms are always redder after a particular shirt, workout, or hair-removal routine, that pattern is worth noticing.

Can You Get Rid of Keratosis Pilaris Permanently?

This is where realistic expectations matter. Keratosis pilaris is harmless, but it can also be stubborn. Treatments and good body-care habits may improve how the skin looks and feels, but there isn’t a permanent cosmetic cure that guarantees the bumps will never return. Both Mayo Clinic and the American Academy of Dermatology note that ongoing maintenance may be necessary, and KP can persist for years even though it becomes less noticeable for many people over time.

I actually think knowing this can make the condition less frustrating. If you expect one scrub to erase KP forever, every returning bump feels like failure. If you understand that this is simply how your follicles tend to behave, the goal becomes much more reasonable: keep the skin comfortable, minimize roughness, reduce unnecessary irritation, and maintain the improvement with a routine you can realistically continue.

You also don’t have to treat KP at all unless it bothers you. It is generally harmless and doesn’t need to be “fixed” simply because skin advertising has convinced us every inch of our bodies should be perfectly smooth. If you want to improve the texture because you prefer how smoother skin feels, that’s different—and there are sensible ways to do it.

When Those Bumps Might Not Be KP

Not every bump on an arm is keratosis pilaris. Folliculitis, acne, eczema, contact dermatitis, ingrown hairs, and other conditions can create bumps or rough patches that look similar at first glance. Classic KP tends to produce many small, rough bumps around follicles, commonly on the upper arms and thighs, and it usually isn’t painful. A dermatologist can often diagnose it simply by examining the skin.

If your bumps are painful, filled with pus, intensely itchy, rapidly spreading, suddenly appearing for the first time, or accompanied by significant inflammation, don’t assume you have KP because a photo on the internet looked familiar. That’s a good time to let a healthcare professional look at your skin.

Your Arms Don't Need to Be Scrubbed Into Submission

Keratosis pilaris can be surprisingly frustrating for something that is medically harmless. You can moisturize, scrub, switch soaps, buy body brushes, pick at individual bumps, and still find yourself staring at the same rough patches every winter. Once you understand that those bumps are associated with plugged hair follicles—not dirty skin or a failure to exfoliate hard enough—the routine becomes much more sensible.

Use exfoliation strategically rather than aggressively. Keep the surrounding skin well moisturized. Pay attention to dry weather, hot water, shaving, and friction. Give your routine enough time to work, and expect that maintenance may be part of living with KP rather than evidence that your skincare has failed.

After years of formulating skincare in Colorado, I’ve learned that rough body skin usually responds better to consistency than punishment. Especially in our climate, I would much rather see skin that still has a little natural texture but feels soft and comfortable than perfectly polished skin that is red, dry, and irritated from trying too hard to make every bump disappear.

You can find more straightforward skincare and ingredient education on the Simple Body blog.

xoxo,
Jewels

This article is for educational purposes and is not medical advice. If bumps are painful, inflamed, filled with pus, intensely itchy, rapidly changing, or you’re unsure whether what you’re seeing is keratosis pilaris, consult a qualified healthcare professional or dermatologist.