Keratosis Pilaris: How to Smooth Bumpy Skin on Arms and Legs

If you have small, rough bumps on the backs of your arms, thighs, or buttocks, you're not alone. These bumps are often caused by keratosis pilaris, a very common and harmless skin condition often nicknamed "chicken skin."

While there's no permanent cure, the right routine can make your skin noticeably smoother.

What Is Keratosis Pilaris?

Keratosis pilaris (KP) happens when keratin, a protein that protects the skin, builds up and plugs hair follicles. These plugs create small, rough bumps that may be skin-colored, red, pink, or brown, depending on your skin tone.

KP is very common in children, teens, and adults. It often improves with age, though it can persist for years.

Common Signs

• Small, rough bumps that feel like sandpaper
• Bumps on the backs of upper arms, thighs, buttocks, and sometimes cheeks
• Redness or darker discoloration around the bumps
• Mild itchiness or dryness
• Worse in cold, dry weather and often better in summer

What Causes Keratosis Pilaris?

The exact cause isn't fully understood, but KP is associated with:

• Genetics: It often runs in families.
• Dry skin: Dryness can make KP more noticeable.
• Eczema: People with atopic dermatitis are more likely to have KP.
• Hormonal changes: It may appear or worsen during puberty and pregnancy.

KP is not contagious, and it isn't caused by poor hygiene.

How to Treat Keratosis Pilaris

The goal of treatment is to gently remove the keratin buildup and keep skin moisturized.

1. Use a Gentle Cleanser

Harsh soaps can make KP worse by drying out the skin. Choose a gentle, fragrance-free body wash. Some people benefit from a body wash with salicylic acid or glycolic acid a few times a week.

2. Exfoliate Chemically

Chemical exfoliants are often more effective and gentler than scrubbing. Look for body lotions or creams with:

Apply these lotions once or twice daily, depending on your skin's tolerance.

Pro tip: Resist the urge to scrub KP aggressively. Harsh scrubbing can irritate the bumps and make redness worse. Gentle chemical exfoliation is usually more effective.

3. Moisturize Consistently

Moisturizing helps soften bumps and prevents dryness. Apply a thick cream or ointment within a few minutes of showering. Ingredients like ceramides, glycerin, and petrolatum are helpful.

4. Keep Showers Short and Warm

Hot water strips natural oils. Keep showers short and lukewarm.

5. Use a Humidifier

KP often worsens in dry winter air. A humidifier can help keep your skin hydrated.

6. Consider Retinoids

Topical retinoids may help some people with KP by promoting cell turnover. A dermatologist can recommend whether a retinoid is right for you.

A Simple KP Routine

In the shower (daily):

• Gentle cleanser, or a salicylic acid wash a few times a week

After showering (daily):

• Apply a lactic acid, urea, or glycolic acid lotion to affected areas
• Follow with a rich moisturizer on very dry days

Daytime:

• Apply sunscreen to treated areas that will be exposed to the sun

What to Expect

KP treatment takes patience. Many people see smoother skin after four to six weeks of consistent use. If you stop treatment, the bumps often return, so ongoing maintenance is key.

Professional Treatments

If over-the-counter care isn't enough, a dermatologist may suggest:

• Prescription-strength exfoliating creams
• Topical retinoids
• Laser or light therapy to reduce redness or discoloration
• Microdermabrasion or chemical peels

When to See a Dermatologist

See a dermatologist if your bumps are very itchy, painful, spreading, or if you're unsure whether you have KP. Other conditions, like folliculitis or eczema, can look similar.

Frequently Asked Questions

Can keratosis pilaris go away on its own?

KP often improves with age, and many people see it fade by their 30s. Treatment can help manage it in the meantime.

Should I pop or pick KP bumps?

No. Picking can cause irritation, infection, and dark marks.

Does diet affect keratosis pilaris?

There's no strong evidence that diet causes KP. Focus on gentle exfoliation and moisturizing.

The Bottom Line

Keratosis pilaris is harmless and common, but it can be frustrating. Use gentle cleansers, chemical exfoliants like lactic acid or urea, and rich moisturizers to smooth bumps. Stay consistent, and see a dermatologist if your skin doesn't improve.