What’s Causing That Rash on My Buttocks?

What's Causing That Rash on My Buttocks? | HealthSoul

It’s not uncommon to develop an itchy, irritated rash on the buttocks. The delicate skin coupled with friction from sitting, heat, moisture and clothing makes the area prone to rashes. While the rash may seem minor, it’s important to understand the possible causes so appropriate treatment can be used.

Buttock Rash Causes

Some common culprits of buttocks rashes include heat rash, jock itch, folliculitis, eczema, psoriasis, allergic reactions, shingles and bacterial infections. The characteristics of the rash along with your medical history can help identify the source. With the right diagnosis, relief from the uncomfortable rash can be found.

Here’s an overview of the most frequent causes of buttocks rashes and how to get them under control:

Heat Rash

Heat rash, also known by its medical term miliaria, is one of the most common reasons for rashes on the buttocks, groin, under breasts and other areas prone to sweating. When sweat ducts become obstructed near the skin’s surface, the trapped perspiration causes inflammation and a red bumpy rash.

Heat rash typically occurs in hot, humid weather but can happen anytime the body overheats. Friction and tight clothing can worsen it. The rash consists of small red bumps or pimples that may itch, tingle or burn. It usually pops up in areas sweat becomes easily trapped.

Treating heat rash involves keeping the skin cool and dry. Wear loose, breathable fabrics and avoid prolonged sweating. Soothing creams containing menthol or pramoxine provide relief from itching. Taking cool showers, using fans or AC, and preventing chafing helps clear up the rash.

For severe or recurrent cases unresponsive to home treatment, a dermatologist may prescribe topical steroid creams to reduce inflammation. With preventative steps, heat rash usually resolves fully in a few days.

Jock Itch

Jock itch, known medically as tinea cruris, is a fungal infection of the groin area that can extend around to the buttocks and upper thighs. It thrives in warm, moist folds of the skin. The telltale rash is red, ring-shaped, and very itchy. Small blisters or cracks in the skin may be present.

Jock itch is highly contagious through skin-to-skin and surface contact. Wearing damp sweaty clothing for prolonged periods raises risk. The fungal spores can survive on clothes, towels, and bedding. Scraping or damaging the skin also makes infection more likely.

Antifungal creams, powders, and sprays applied daily for 2-4 weeks clear most cases. Keeping the area clean, cool and dry prevents recurrence. Wash clothes, towels and sheets in hot water and dry thoroughly. Tight clothing should be avoided.

For severe, recurrent or widespread fungal rashes, oral antifungal medications may be prescribed. Partners should also be treated to avoid reinfection. With consistent treatment, jock itch resolves fully in most people.


Folliculitis refers to inflammation of the hair follicles. On the buttocks, it often stems from friction, shaving irritation, or bacterial infection in the follicle. Tiny red bumps with a halo of redness form around hair roots. It may burn, itch or feel tender.

Pseudofolliculitis barbae, also called “razor bumps,” is a common type of folliculitis from shaving coarse hair. The sharp regrowing hairs curl under the skin and drive inflammation. Other risk factors include skin irritation, prolonged sweating, oil production and ingrown hairs.

Mild folliculitis often clears with warm compresses, gentle cleansing and avoiding further irritation. Antibacterial soaps and benzoyl peroxide washes kill bacteria and help resolve infection. For widespread folliculitis or cases unresponsive to home treatment, antibiotics may be prescribed.

To prevent recurrence, proper shaving technique, antimicrobial body washes and hydrocortisone creams calm inflammation in follicles. Keeping friction limited allows follicles to heal. Severe cases may require laser hair removal for permanent relief.


Eczema is a chronic skin condition causing irritated, itchy rashes that can affect the buttocks and other areas like the hands, face, and arms. Patches of rough, red, inflamed skin with small bumps or blisters characterize eczema outbreaks. They often occur in skin creases.

While its exact cause is unknown, eczema flares are linked to genetic factors, environmental triggers, irritation, allergies and a hypersensitive immune response. Flare-ups can range from mild to severe. Dry skin and scratching worsens symptoms.

To manage eczema on the buttocks, dermatologists often recommend gentle cleansers, daily moisturizers to protect the skin barrier, topical anti-inflammatory creams, avoidance of triggers, and antihistamines to control itching. Phototherapy or oral medications help severe cases.

Controlling flare factors like weather changes, harsh fabrics, sweat, stress and allergens is also key. With a skin care routine tailored to their needs, most patients find relief from eczema outbreaks.


Psoriasis is an inflammatory autoimmune condition that causes buildup of skin cells. This results in raised, scaly, red patches that can appear anywhere on the body. On the buttocks, psoriasis often forms along the gluteal cleft. Lesions may itch, crack, ooze or bleed.

Psoriasis has genetic underpinnings but can also be triggered by stress, injuries, certain medications, throat infections and skin irritation. Flare-ups alternate with periods of clearing and remission.

Topical treatments like moisturizers, coconut oil, salicylic acid, and prescription creams help improve mild cases. Phototherapy, biologic medications, oral pills, or injections control moderate to severe psoriasis. Dermatologists often use combined approaches to effectively manage symptoms.

While not curable, psoriasis is controllable for most patients. Preventing chafing, managing weight, and reducing flare triggers keeps outbreaks at bay. Patients usually find a suitable treatment plan with their dermatologist’s help.

Allergic Contact Dermatitis

An allergic skin reaction can sometimes cause a red, itchy rash on the buttocks. Common triggers include chemicals in clothing or laundry detergent, fragrances, poison ivy and metals like nickel in snaps or zippers. The rash typically follows the shape of contact with the irritant.

To diagnose contact dermatitis, dermatologists often do patch testing to identify the specific allergen. Avoiding the substance is then recommended, along with hydrocortisone cream for itching and inflammation. Oral antihistamines also provide relief.

Once the irritant is removed, the rash normally resolves within 1-2 weeks. For severe cases, topical or oral steroids may be prescribed to calm the hypersensitive immune reaction. Finding and eliminating the trigger is key to stopping recurrent contact dermatitis.


Shingles is a viral infection stemming from reactivation of the chickenpox virus. It causes a painful, blistering rash following the path of affected nerve fibers. On the buttocks, shingles often forms a belt-like band on one side. Blisters and extreme sensitivity may precede the rash.

Antiviral medications are crucial if started within 72 hours of the earliest symptoms. They help shorten the course of shingles and reduce risk of complications like nerve pain. Cool compresses, calamine lotion, pain relievers, nerve blocks, and numb creams bring relief while the blisters heal.

Most cases of shingles resolve within 2-4 weeks. But nerve pain can linger after the rash clears. Getting medical treatment quickly reduces viral activity and can limit long-term problems. The shingles vaccine also prevents outbreaks in older adults.

Bacterial Infections

Sometimes a bacterial skin infection is the culprit behind a rash on the buttocks. Common types include:

Impetigo – Highly contagious bacterial infection marked by fluid-filled blisters that rupture, ooze and crust over into a yellowish scab. Oral and topical antibiotics clear most cases.

Cellulitis – Potentially serious bacterial spread into deeper skin layers, causing expanding redness, swelling, pain and fever. Intravenous antibiotics and hospitalization are often needed.

MRSA – Antibiotic-resistant staph bacteria resulting in a firm, painful red bump that forms pus. Drainage and culture-specific antibiotics treat the infection.

For any rash on the buttocks that seems to be worsening or accompanied by fever, it’s important to seek prompt medical treatment. This could signal a deeper skin infection requiring aggressive medication.

Relief Awaits the Right Diagnosis

Rashes on the buttocks can stem from multiple causes. Getting an accurate diagnosis is key to finding the appropriate remedies for relief, whether it’s topical creams, oral medication, allergen avoidance or preventative steps. A dermatologist can identify characteristics distinguishing common rashes like heat rash, jock itch, folliculitis and eczema.

If home treatment doesn’t adequately control an irritated, itchy or painful rash on your buttocks within two weeks, make an appointment for evaluation. Diagnosing and properly treating the underlying cause provides the solution to clearing up that frustrating rash for good.