Why a Detox Diet Can Cause a Rash — and What to Do if It Happens
Diet & NutritionFood Safety

Why a Detox Diet Can Cause a Rash — and What to Do if It Happens

Why a Detox Diet Can Cause a Rash — and What to Do if It Happens
Everyday Health
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Updated on February 26, 2026
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Looking to lose weight and boost your health as quickly as possible? In this case, detox diets may be alluring to you. They claim to help you flush out toxins from your system, typically by way of a lot of liquid, a severely restrictive diet, or dietary supplements.

 But such regimens are ripe for causing more harm than good. First, there is no long-term research on the effects of detox diets, and the small number of studies that do exist aren’t of high quality.

 Furthermore, the potential side effects are aplenty: Along with fatigue, headache, and nausea, some people may develop a “detox rash” characterized dry, itchy skin, according to experts.

While some people attribute rashes to the irritating effects of toxins released through the skin as part of the purification process, registered dietitians and dermatologists hold that no actual detoxification is happening. Rather, such skin troubles are more likely to be related to nutritional imbalances, food sensitivities, or reactions to supplements that an individual may be taking as part of their regimen.

What Is a Detox Diet?

Detox diets focus on eliminating certain foods and ingredients, to various degrees of intensity. Most detoxification diets require at least eliminating highly processed foods and many plans eliminate foods to which some people are sensitive, such as dairy, gluten, peanuts, red meat, and eggs, according to the Academy of Nutrition and Dietetics. Many detox programs also recommend eating mostly organic vegetables, fruit, whole grains, nuts, seeds, and lean protein. Some methods encourage fasting, which may actually suppress the body’s natural detoxification process, and underscore why many medical professionals advise against following such plans.

Three major types of “detox” diets (sometimes called “cleanse” diets) are:

  • Liquid diets. This approach to detoxing limits nutritional intake to juices, smoothies, and soups, along with some possible herbal supplements.

     Some detox programs may emphasize liquids — such as green tea and water — but not eliminate solid foods altogether.

  • Liver or kidney cleanses. These eating plans prioritize foods thought to support liver and kidney function. Liver diets may stress foods such as garlic, citrus fruits, turmeric, walnuts, beets, carrots, green tea, apples, and avocados.

     Kidney diets may highlight apple cider vinegar, kidney beans, lemon juice, watermelon, pomegranate, basil, dates, and dandelion.

  • Digestive system cleanses. Sometimes called a “colon cleanse,” these diets involve fiber-rich foods, heavy hydration, and foods that foster good gut bacteria (such as yogurt, garlic, and onions), while limiting highly processed foods.

Before you try any diet plan, consult your healthcare provider or registered dietitian, who can work with you to create a safe and healthy plan to support your needs and lifestyle.

What Registered Dietitians Say About Detox Diets and Detox Skin Rash

Whether detox diets work or are even good for you is a topic of considerable debate.

“Your body already has highly effective detox systems — primarily the liver, kidneys, GI tract, and lungs,” says Lena Beal, RDN, a cardiovascular dietitian at Piedmont Atlanta Hospital and a spokesperson for the Academy of Nutrition and Dietetics. “Most ‘detox or cleanse’ claims are not supported by strong human research.”

With a lack of research to conclude one way or another, some may classify skin issues that emerge amid a detox as a sign that the diet is working to rid the body of harmful substances. Beal does not subscribe to this school of thought, noting that in this case, a rash is likely a red flag that something in the eating plan is causing problems, not curing them.

Why You May Develop a Rash From a Detox Diet

Certain eating plans may upset the body’s natural balance, which can lead the skin to react — sometimes in the form of a rash. A detox diet may cause a rash because of the following:

Supplement Overload

Rebecca Blake, RD, CEO of Rebecca Blake Nutrition in New York City, notes that some detox plans encourage high supplement usage. When taken outside the supervision of a physician or registered dietitian, she says supplements could actually lead to toxicity related to vitamin and mineral levels, some of which could present as dermatological symptoms.

"For instance, high doses of B vitamins are all associated with symptoms such as rashes, hives, redness, flushing, welts, and itchiness,” she says.

Some detox methods call for elevated amounts of vitamin B3 (also known as niacin). Taking too much, however, can lead to warm, itchy or tingly, red skin, sometimes called “the niacin flush.”

Nutritional Deficiencies

Nutrient shortfalls from severe dietary restriction can impair the skin barrier and healing, according to Sara Moghaddam, MD, a dermatologist with Delmarva Skin Specialists in Selbyville, Delaware. “Rapidly eliminating food groups can lead to deficiencies in essential fatty acids and vitamins, such as zinc or B vitamins, which are critical for skin repair and wound healing,” she says.

Keto Rash

Some believe the ketogenic diet — a type of low-carb eating plan — can also purge the body of toxins. Eamonn Maher, MD, a dermatologist and an assistant professor at the University of Minnesota in Minneapolis, warns that this regimen may also cause a “keto rash.” Specifically, people on the diet may experience an irritation called prurigo pigmentosa (in medical terms) as the body switches to burning fat instead of carbs.

Allergies or Sensitivity to New Foods

Depending on the detox diet in question, you may try foods that you haven’t eaten before and discover an allergic reaction. Certain high-histamine, histamine-releasing, or allergen-heavy foods, for instance, can trigger hives, itching, and eczema.

Gut Bacteria Changes or Inflammation Triggering Flaring Skin Conditions

A number of skin conditions are linked to gut health status. Specifically, research has connected imbalances in the types of organisms found in the gut microbiome to skin issues like acne, atopic dermatitis, psoriasis, and rosacea.

What to Do If You Get a Detox Rash

Good news: Many detox rashes are mild and temporary. For minor rashes, some home remedies might provide relief, such as sticking with fragrance-free skin care and unscented soap, and trying over-the-counter 1 percent hydrocortisone.

However, it’s also important to consider the type of detox you’re doing that may have led to your rash. Keto rash, for example, may require treatment with antibiotics.

 If a rash is long-lasting and very uncomfortable (itching or burning), a consultation with a dermatologist may be in order.

“Keto rash can take weeks to months to resolve, so I would recommend looping in your primary care physician when symptoms first arise so they can help you navigate and treat the symptoms,” says Blake.

A dermatologist can confirm whether a rash is due to diet or because of some other cause. With a proper diagnosis, you can then get the appropriate treatment.

 If diet is the suspected culprit behind a rash, Dr. Moghaddam will first try reintroducing missing nutrients to correct a deficiency. She cautions that in some cases skin improvement may be gradual and require time. To replenish the skin barrier, she recommends consistent use of moisturizers containing ceramides is the first step toward good skin health, and if the rash is severe, prescription anti-inflammatory medications may be necessary.

“Our bodies can do a remarkable job of detoxifying themselves when we eat a largely whole foods–based diet with plenty of fiber, hydration, and regular exercise,” says Blake. “If someone is looking to solve for any other health issues by doing a detox or cleanse, we recommend consulting with a healthcare professional.”

The Takeaway

  • There is insufficient research to show that detox diets actually help rid the body of harmful substances.
  • Detox diets can lead to rashes, which are often mild and temporary.
  • Some detox-related rashes can be more long-lasting and uncomfortable. Visit a dermatologist to identify the specific skin issue and land on a tailored treatment.

Resources We Trust

Cleveland Clinic: Keto Rash (Prurigo Pigmentosa)

UCLA Health: Should You Do a Cleanse?

Academy of Nutrition and Dietetics: What’s the Deal With Detox Diets?

American Academy of Dermatology: Rashes

Rush University System for Health: The Truth About Toxins

EDITORIAL SOURCES
Everyday Health follows strict sourcing guidelines to ensure the accuracy of its content, outlined in our editorial policy. We use only trustworthy sources, including peer-reviewed studies, board-certified medical experts, patients with lived experience, and information from top institutions.
Resources
  1. Jones V et al. Detoxes, Cleanses and Fasts: What You Should Know. The University of Texas MD Anderson Center. April 29, 2025.
  2. “Detoxes” and “Cleanses”: What You Need To Know. National Center for Complementary and Integrative Health. March 2025.
  3. What’s the Deal With Detox Diets? Academy of Nutrition and Dietetics. January 7, 2026.
  4. Should You Do a Cleanse? UCLA Health. June 12, 2024.
  5. Detox or Cleanse: What To Know Before You Start. Cleveland Clinic. March 18, 2024.
  6. What Foods Cleanse Your Liver? Fisher-Titus Health System.
  7. Eight Easy Ways to Cleanse Your Kidneys. Advance Urology Institute. October 11, 2017.
  8. Can colon cleansing get rid of toxins from the body? Mayo Clinic. May 10, 2024.
  9. Javaid A et al. Niacin-induced flushing: Mechanism, pathophysiology, and future perspectives. Archives of Biochemistry and Biophysics. November 2024.
  10. Sharma N et al. Dietary Influences on Skin Health in Common Dermatological Disorders. Cureus. February 9, 2024.
  11. Shanshal M and Jackson E. Prurigo Pigmentosa (Keto Rash) Secondary to an Eating Disorder: A Case Report and Proposed Diagnostic Criteria. Cureus. August 16, 2025.
  12. Histamine Intolerance. Cleveland Clinic. August 27, 2024.
  13. Mahmud M et al. Impact of Gut Microbiome on Skin Health: Gut-Skin Axis Observed Through the Lenses of Therapeutics and Skin Diseases. Gut Microbes. Jan-Dec 2022.
  14. Keto Rash (Prurigo Pigmentosa). Cleveland Clinic. November 4, 2025.
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