An underarm rash can be uncomfortable, itchy, alarming, and sometimes painful. Many people search online for “underarm rash pictures” because they want to compare what they are seeing with common skin conditions.
The problem is that several different conditions can cause an armpit rash, and many of them look surprisingly similar.
As a doctor, I often see patients concerned about:
- Red patches under the arms
- Itching or burning
- Small bumps or pimples
- Darkened skin
- Peeling skin
- Painful irritation
- Moist or flaky rashes
In this guide, I’ll explain:
- The most common causes of underarm rashes
- What different armpit rashes may look like
- Symptoms that may help identify the cause
- Treatment options
- Warning signs that require medical attention
Why Do Underarm Rashes Happen?
The underarm area is especially prone to skin irritation because it is:
- Warm
- Moist
- Frequently shaved
- Exposed to friction
- Often covered by tight clothing
- In contact with deodorants and sweat
This environment makes the armpits vulnerable to:
- Fungal infections
- Irritation
- Allergic reactions
- Bacterial infections
- Inflammatory skin conditions
Contact Dermatitis Underarm Rash
One of the most common causes of an armpit rash is Contact dermatitis.
This occurs when the skin reacts to:
- Deodorant
- Antiperspirant
- Soap
- Laundry detergent
- Fragrances
- Shaving cream
- Fabric materials
What It May Look Like
Underarm rash pictures from contact dermatitis often show:
- Red irritated skin
- Dry patches
- Itching
- Burning
- Flaking skin
- Mild swelling
Sometimes the rash appears only in the exact areas where products are applied.
Common Clues
- Rash appears after switching deodorants
- Symptoms worsen after shaving
- Both armpits are affected equally
- Itching is prominent
Fungal Underarm Rash (Yeast Infection)
A fungal infection is another very common cause of underarm rash.
Yeast thrives in warm, damp skin folds.
The most common fungal culprit is Candidiasis.
What Fungal Underarm Rash Pictures Often Show
- Bright red rash
- Moist or shiny appearance
- Small red satellite bumps around the main rash
- Itching and burning
- Skin cracking
The rash may worsen:
- During hot weather
- After sweating
- In people with diabetes
- After antibiotics
Common Symptoms
- Persistent itching
- Skin soreness
- Odor
- Moist skin irritation
Heat Rash in the Armpit
Heat rash occurs when sweat ducts become blocked.
This is especially common in:
- Hot climates
- Exercise
- Tight clothing
- Excessive sweating
Heat Rash Pictures Often Show
- Tiny red bumps
- Prickly sensation
- Mild redness
- Clusters of small irritated spots
Heat rash usually improves once the skin cools and dries.
Razor Burn and Shaving Rash
Many underarm rashes are directly related to shaving.
Shaving may cause:
- Skin irritation
- Follicle inflammation
- Tiny cuts
- Ingrown hairs
Razor Rash Pictures Often Show
- Small red bumps
- Burning skin
- Tenderness
- Patchy irritation
- Pimples around hair follicles
This often appears shortly after shaving.
Folliculitis Under the Arms
Folliculitis occurs when hair follicles become inflamed or infected.
What Folliculitis Looks Like
Underarm rash pictures from folliculitis commonly show:
- Small pus-filled bumps
- Red inflamed follicles
- Tender spots
- Acne-like lesions
Folliculitis may develop after:
- Shaving
- Sweating
- Friction
- Bacterial exposure
Eczema Under the Armpits
Eczema can affect the underarms, particularly in people with sensitive skin or allergies.
Eczema Rash Pictures Often Show
- Dry irritated patches
- Thickened skin
- Itching
- Red or darker skin discoloration
- Cracking
Symptoms often flare periodically.
Psoriasis in the Armpits
Inverse psoriasis can develop within skin folds, including the underarms.
Psoriasis may appear differently in skin folds compared with classic psoriasis plaques.
Underarm Psoriasis Pictures Often Show
- Smooth red patches
- Shiny irritated skin
- Minimal scaling
- Symmetrical rash
Sweat and friction often worsen symptoms.
Hidradenitis Suppurativa
One important condition that should not be overlooked is Hidradenitis suppurativa.
This chronic condition affects areas containing sweat glands and hair follicles.
Hidradenitis Suppurativa Pictures Often Show
- Painful lumps
- Boils
- Drainage
- Scarring
- Recurrent abscesses
Unlike simple irritation, hidradenitis tends to recur repeatedly.
Warning Signs
- Deep painful bumps
- Drainage with odor
- Scarring
- Repeated flare-ups
Medical treatment is often necessary.
Can an Underarm Rash Be Caused by Deodorant?
Yes — this is extremely common.
Many deodorants contain:
- Fragrances
- Alcohol
- Preservatives
- Aluminum compounds
These ingredients may trigger irritation or allergic reactions.
If deodorant is the cause:
- Symptoms often improve when stopping the product
- Switching to fragrance-free products may help
- Burning may occur immediately after application
Can Stress Cause Underarm Rashes?
Stress can worsen certain inflammatory skin conditions, including:
- Eczema
- Psoriasis
- Hives
Stress may also increase sweating, which can aggravate fungal and irritation-based rashes.
Underarm Rash Treatment
Treatment depends entirely on the underlying cause.
General Measures That Often Help
- Keep the area dry
- Wear loose cotton clothing
- Avoid fragranced products
- Stop shaving temporarily
- Use gentle soap
- Reduce friction
Treatments for Common Causes
Contact Dermatitis
May improve with:
- Avoiding irritants
- Hydrocortisone cream
- Fragrance-free products
Fungal Rash
May require:
- Antifungal creams
- Keeping skin dry
- Reducing sweat accumulation
Bacterial Folliculitis
Sometimes needs:
- Antibacterial washes
- Antibiotics
- Improved hygiene
Eczema or Psoriasis
Often treated with:
- Prescription creams
- Moisturizers
- Anti-inflammatory medications
When Should You See a Doctor?
You should seek medical attention if the rash:
- Becomes painful
- Spreads rapidly
- Produces pus
- Causes fever
- Does not improve
- Recurs frequently
- Develops lumps or abscesses
- Causes severe itching or swelling
Persistent underarm rashes sometimes require testing to determine the exact cause.
Can Underarm Rashes Be Serious?
Most underarm rashes are minor and treatable.
However, some conditions — particularly infections or hidradenitis suppurativa — may require medical treatment.
Rarely, persistent rashes may signal:
- Autoimmune conditions
- Chronic inflammatory disorders
- Rare skin cancers
This is why ongoing or worsening rashes should not be ignored.
Frequently Asked Questions
What does a fungal underarm rash look like?
Fungal rashes are often bright red, itchy, moist, and may have small satellite bumps around the edges.
Why do I keep getting a rash under my arms?
Common recurring causes include deodorant irritation, sweating, fungal infections, eczema, and shaving irritation.
Can deodorant cause an underarm rash?
Yes. Fragrances, preservatives, and aluminum compounds in deodorants commonly trigger irritation or allergic reactions.
What cream helps underarm rash?
This depends on the cause. Antifungal creams help fungal infections, while hydrocortisone may help inflammatory rashes. Incorrect treatment can sometimes worsen symptoms.
When should I worry about an underarm rash?
Seek medical attention if the rash is painful, spreading, producing pus, associated with fever, or repeatedly returning.
Final Thoughts
Searching for “underarm rash pictures” is understandable because many skin conditions can look similar in the armpit area.
Common causes include:
- Contact dermatitis
- Fungal infections
- Razor irritation
- Folliculitis (more info)
- Eczema
- Psoriasis
- Hidradenitis suppurativa (read more)
Because treatments vary depending on the exact diagnosis, persistent or worsening rashes should be evaluated by a healthcare professional.
Most underarm rashes improve with proper skin care, avoiding triggers, and targeted treatment once the underlying cause is identified.