Why Do I Have Bumps on My Arms?


Whenever you encounter unfamiliar bumps on your skin, it can be stressful. You might ask yourself: Are the bumps dangerous? Will they go away? What caused these bumps to begin with?

Bumps on the arms are pretty common. Unless they gradually change or enlarge overtime, these bumps are usually harmless.

Most bumps on the arms are caused by a condition called keratosis pilaris. There are other possible causes, too, ranging from inflammatory skin conditions to irritation, such as folliculitis.

With the wide range of possible causes, you shouldn’t self-diagnose bumps on your arms. However, you can use the information below to start investigating the underlying causes, which you can discuss further with your dermatologist or doctor.

The most common cause

Keratosis pilaris, commonly known as “chicken skin,” is the most common cause of bumps on your arms. This condition is characterized by small red or brown bumps that develop on the backs of your upper arms. They may also occur on the backs of your thighs and the buttocks.

While chicken skin can be frustrating, it isn’t harmful. Like acne, the bumps develop when dead skin cells get trapped in your pores. Some, but not all, of the bumps may have pimple-like heads. However, most keratosis pilaris bumps on the arms are small and flat.

What makes keratosis pilaris difficult to prevent entirely is the fact that it can be hereditary. But since the bumps are linked to dead skin cell buildup, you can help treat them and prevent others from forming with regular exfoliation.

Dermabrasion and chemical peels from a dermatologist can also help in more severe cases.

Dry, less humid times of the year can also contribute to the development of these bumps. Regular exfoliation can still help, along with keeping your skin hydrated with lotion. While the bumps may feel dry and rough to the touch, keratosis pilaris is not itchy.

Aside from your genes, you may be at risk for keratosis pilaris bumps if you have one or more of the following:

  • eczema
  • dry skin
  • dead skin cell buildup (ichthyosis)
  • allergies and hay fever
  • a history of skin cancer
  • obesity

Chicken skin also occurs more often in women, as well as teens and young adults.

Pictures of arm bumps

Keratosis pilaris consists of numerous small bumps that often occur in patches. They aren’t itchy, but they can range in color from flesh-colored to red, pink, or brown bumps.

Take a look to see how these pictures of keratosis pilaris compare to the bumps on your arms and to a few other possible causes.

Other causes

Chicken skin is the most common cause of arm bumps. However, it isn’t the only possible cause.

Keratosis pilaris isn’t itchy, but some other types of arm bumps can be. If the bumps on your arms are itchy, then consider the possible causes below.


Some bumps on the arms can be itchy. This is partly due to inflammation and irritation in the skin. Possible itchy bumps that may develop on the arms include:

  • Eczema. This is an inflammatory skin condition that can cause a red itchy rash that may be raised in some areas.
  • Hives. These are red bumps that develop from an allergic reaction.
  • Folliculitis. This is a condition where multiple bumps on the skin are caused by inflamed hair follicles.
  • Heat rash. This is caused by excessive heat and results in clogged sweat in your pores.
  • Psoriasis. This is another inflammatory skin condition that has notable red to silvery skin patches from excessive skin cell growth.


Unlike the itchy skin bumps mentioned above, keratosis pilaris doesn’t itch. Another non-itchy cause of bumps on the arms is acne. Pimples on the arms can develop when your pores get clogged with:

  • dead skin cells
  • bacteria
  • dirt
  • oil

Skin cancers may or may not cause itchiness. This cause of arm bumps is rare, but prompt diagnosis is important in preventing the tumors from spreading.


Knowing what chicken skin looks like can help you determine whether your arm bumps are related to keratosis pilaris or another common condition.

Your doctor can also diagnose the bumps on your arms with a physical exam. Since there are numerous possible causes of skin bumps, it’s important to get the correct diagnosis so you can properly treat them.

In some cases, you may be referred to a dermatologist for diagnosis and treatment. This is especially true if your general practitioner suspects an inflammatory skin condition, such as eczema or psoriasis.

If the cause of your arm bumps isn’t quite clear, a dermatologist may conduct a biopsy. Especially useful in ruling out skin cancers, a biopsy involves scraping off a small amount of the skin bump and studying it under a microscope.


As mentioned above, keratosis pilaris is treatable with regular exfoliation, as well as deeper exfoliating treatments, such as dermabrasion. In severe cases, your dermatologist may prescribe a retinol cream to help clear up the bumps.


Exfoliating can help other causes of arm bumps, too. This process helps to remove dead skin cells from the top layer of skin so they don’t get trapped in your pores.

To that end, exfoliation techniques may be helpful for acne, psoriasis, and dead skin cell buildup. You can use a loofah or a washcloth to gently exfoliate. Be careful not to scrub, as this can cause irritation and possibly even more bumps to form.


Other treatment measures for bumps on your arms depend on the underlying causes. Exfoliation can irritate eczema, folliculitis, and heat rash. Plus, this process won’t get rid of more serious bumps, such as skin cancers.

Inflammatory skin diseases may be treated with topical creams to help soothe the inflammation and prevent more bumps from occurring.

Over-the-counter creams with oatmeal or hydrocortisone can help soothe itchy skin bumps and provide some relief. If your skin doesn’t improve, you may need a prescription ointment.

If allergies are suspected to contribute to your skin bumps, you may need to take an antihistamine. Skin reactions to allergens can take some time to clear up, but treatment and prevention will help clear up the related skin bumps.

When to see a doctor

While it’s tempting to self-diagnose arm bumps, it’s always a good idea to see a doctor for confirmation. You should also see your doctor if the bumps worsen or change in shape or size.

Make an appointment if you start to see any signs of infection as well. Symptoms of a skin infection include increased inflammation, oozing, and pus from the bumps.

The bottom line

Bumps on the arms can be a nuisance, but this is an extremely common phenomenon. In most cases, chicken skin is to blame, and it can be cleared up with regular exfoliation.

Other causes of arm bumps may require a doctor’s visit and medical treatment. When in doubt, it’s always a good idea to see your doctor.



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