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A Rash on the Buttocks From Running

By Jae Allen ; Updated December 29, 2017

Any kind of itching or rash experienced during running can be irritating enough to cut your workout short. A rash on the sensitive area of the buttocks can happen due to several dermatological irritants, environmental factors or an underlying health problem.

The benefits of regular exercise can outweigh the difficulties associated with a rash. Understand what may be the cause of your condition, and if home remedies don't work, talk to your doctor about preventative and treatment options for a running-induced rash.

Acne Mechanica

Acne mechanica is a type of acne which most commonly occurs in a warm, moist environment — and particularly those areas experiencing forces of friction during exercise. Tight-fitting athletic apparel not made of breathable material can cause a flare-up of acne mechanica on a runner's buttocks area.

Reduce your risk of acne mechanica on the buttocks by opting for running shorts made of loose-fitting, moisture-wicking fabrics. If these preventative measures fail, prescription medications for acne mechanica are available.

Read more: Causes of Itching Without Rash

Heat Rash

If you are running in a hot or humid environment, it's possible to develop heat rash on the buttocks. Heat rash commonly occurs in hot and humid weather, when sweat ducts get blocked and your perspiration cannot escape through your skin.

Heat rash may manifest as blisters or a red, lumpy rash. Heat rash may feel prickly or itchy, and typically resolves once your skin becomes cooler and sweating decreases.

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Contact Dermatitis

Contact dermatitis occurs when your skin comes into contact with an irritant or allergen. Laundry detergent is a common irritant for individuals suffering contact dermatitis. If you recently changed brands, it may be the culprit.

Common symptoms of contact dermatitis include an itchy rash, redness and even small, raised bumps. If you believe your rash is related to irritants or allergens in your laundry detergent, try switching to hypoallergenic detergent, or one intended for sensitive skin.

Read more: What are the Causes of a Rash on the Chest

Allergy to Sweat

It is possible to develop an allergy to your own sweat. You sweat more during strenuous exercise than when at rest, and the increased presence of sweat during your runs could affect the skin on your buttocks.

People with the skin condition cholinergic urticaria — one of a number of conditions categorized as "hives" — are typically allergic to their own sweat.

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