Bumps on Skin: Causes, What to Do & Pictures

Medical review: Dr. Clarisse Bezerra
Family Doctor
January 2023

Bumps can appear on the skin in adults or children. They are generally not a sign of a serious illness, and usually occur due to keratosis pilaris, acne, foliculitis or a skin allergy.

Bumps on skin can also be a sign of a gluten intolerance, especially if the bumps are accompanied by intense itching and gastrointestinal symptoms. 

If you notice that you have bumpy skin, you should see a doctor for assessment. The doctor will inspect the bump characteristics, where they appear and will ask about other symptoms to conclude a diagnosis and start treatment as necessary.

Main causes of bumps on skin

The most common causes of bumpy skin are:

1. Keratosis pilaris 

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Bumps that appear on the side or back of the arms or bumps that appear on your glutes can appear due to excessive production of keratin in the skin. This change is a genetic characteristic and therefore there is no cure. However, if it is left untreated, the bumps can become inflamed from touching them with dirty hands, leading to darkened skin. 

What to do: These bumps tend to appear more often in the summer due to sweat and use of tighter clothing. Therefore, you should opt to use light clothes that allow to the skin to breathe. You should also avoid exfoliating, as this can worsen the bumps. Use moisturizing creams with urea, glycolic acid os salicylic acid as active ingredients to control the production of dead cells and keep the skin hydrated. 

2. Acne or pimples

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Acne or pimples can appear as red bumps and mostly affect adolescents and young adults. They are more common in the summer and can cause other symptoms like itching, especially with excessive sweating. 

What to do: You should use skin products that are aimed at treating acne. You should look for products that control sebum production and manage oiliness to prevent pimples from getting larger or more inflamed. You should avoid squeezing pimples, as this habit can lead to scarring that is difficult to treat. 

3. Ingrown hairs

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Ingrown hairs, also known as folliculitis, is another common cause of small bumps or lumps in the arms, groin, legs and armpits. They are usually related to shaving, but can also occur due to tight clothing that causes consisten friction against the skin. 

What to do: You should exfoliate the skin frequently, especially before hair removal. Looser clothing can also help to prevent ingrown hairs. If you suspect that an ingrown hair has become infected, the doctor may prescribe a topical antibiotic to be applied for 7 to 10 days. 

4. Skin reaction

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A skin reaction can cause intense itching, which can lead to the formation of small, crusting bumps or wounds. This reaction can occur due to food allergies, animal fur, certain fabrics, cosmetic products or contact with an insect. 

What to do: The doctor may recommend treatment with an anti-allergenic, like hydroxizine or cetirizine. You should run the affected skin under water to remove the trigger and soothe the skin. With more severe cases, you should proceed to the emergency room, as injectable medication may be required.  

5. Shingles

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Shingles, also known as herpes zoster, is caused by the same virus as chicken box. Its main symptom is the appearance of red bumps on the skin, particularly on the chest, back and abdomen. These bumps develop into blisters that are itchy and painful. 

What to do: You should be assessed by a doctor if you suspect shingles so that a diagnosis can be confirmed. Treatment is aimed at decreasing virus activity, which is normally done with antivirals.

6. Gluten intolerance 

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A gluten intolerance usually presents with gastrointestinal symptoms, however dermatitis can also occur. It is common to have small, itchy bumps that burn and then peel to appear after consuming gluten.

What to do: The doctor may indicate the use of ointments or creams to relieve skin symptoms, however lifestyle habits will be necessary to prevent future reactions. You should avoid eating food with gluten, like wheat, rye and barley. 

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Edited by Tua Saude editing team in January 2023. Medical review completed by Dr. Clarisse Bezerra - Family Doctor in April 2022.


  • UNIVERSIDADE ESTADUAL PAULISTA. Doença Celíaca / Intolerância ao Glúten . Available on: <https://www.ict.unesp.br/php/stsaude/arquivos/Doenca_Celiaca.pdf>. Access in 08 Apr 2021
  • MINISTÉRIO DA SAÚDE. Doença Celíaca. Available on: <https://portalarquivos.saude.gov.br/images/pdf/2016/fevereiro/05/Doen--a-Cel--aca---PCDT-Formatado---port1449-2015.pdf>. Access in 08 Apr 2021
Medical review:
Dr. Clarisse Bezerra
Family Doctor
Dr. Bezerra possesses a medical degree and specializes in family medicine. She is licensed to practice under CRM-CE licence #16976.