Armpit rash: common causes and when to get it checked

A red, itchy, or stinging rash under the arm has many possible causes, from razor irritation to a reaction to a product to a yeast infection. Treatment depends on the cause, so this page explains what the major medical sources say and when to see a clinician. It does not diagnose your rash or recommend a product to treat it.

When to contact a healthcare provider

Cleveland Clinic advises contacting a provider if an armpit symptom gets worse or does not improve with treatment, if a rash spreads to other parts of your body, if you cannot sleep, if you have swollen lymph nodes or a lump in your armpit, severe armpit pain or a fever, or a new skin growth or lesion (Cleveland Clinic).

MedlinePlus adds signs of infection such as tenderness, redness, warmth, or fever, a severe reaction, or a rash that does not get better after treatment (MedlinePlus).

Using an antiperspirant or deodorant? FDA-required antiperspirant labels say “Do not use on broken skin” and “Stop use if rash or irritation occurs” (21 CFR 350.50). If a rash appears where you apply a product, stop using it and ask a clinician. Maxim makes underarm antiperspirants; they are not a treatment for any rash, and this page does not recommend them for one.

Common causes

Cleveland Clinic lists several common causes of itchy armpits: razor burn after shaving, ingrown hairs, irritation from chemicals in deodorant, soap, or laundry detergent, a reaction to a medicine, and underlying conditions including heat rash, contact dermatitis, eczema, psoriasis, yeast infection or intertrigo, and folliculitis (Cleveland Clinic). The categories below describe the main ones in the sources’ own terms.

Contact dermatitis

AAD explains that contact dermatitis develops when something touching the skin either irritates it or triggers an allergic reaction. The first sign is often itching, followed by a rash; it is not contagious (AAD). MedlinePlus notes that an allergic rash may not appear until 24 to 48 hours after exposure, and can be red, streaky, or patchy, sometimes with bumps or blisters.

Armpit yeast infection

Cleveland Clinic describes a bright red, usually intensely itchy rash in the skin folds of the armpit, sometimes with small pimple-like spots, caused by the yeast Candida, which thrives in warm, moist conditions. A provider can often diagnose it by examining the skin, and treatment usually involves an antifungal medicine (Cleveland Clinic).

Intertrigo

Cleveland Clinic describes intertrigo as inflammation where skin folds rub together with heat and moisture. When it is not infected, the main approach is keeping the area clean, cool, and dry (Cleveland Clinic).

Shaving irritation and ingrown hairs

Cleveland Clinic suggests not shaving until the symptom goes away, or changing your razor blade.

Gentle care the sources describe

These general steps come from the sources below. They are not a substitute for a diagnosis, and the right treatment depends on the cause.

Wash gently and dry thoroughly. Cleveland Clinic suggests a daily bath or shower, especially after sweating, and patting skin dry rather than rubbing for intertrigo.
Stop the suspected trigger. For contact dermatitis, MedlinePlus says treatment often includes washing the area with plenty of water to remove traces of the irritant and avoiding further exposure. AAD says only avoiding the cause can get rid of contact dermatitis. Cleveland Clinic suggests switching underarm products to unscented or hypoallergenic ones.
Pause shaving until the skin settles, or change the blade (Cleveland Clinic).
Choose breathable clothing. Cleveland Clinic suggests loose clothing and breathable fabrics such as cotton, and avoiding irritating materials like wool.
Moisturize if the skin is dry. MedlinePlus says emollients help the skin repair itself in irritant contact dermatitis.

Medicines such as antifungals, antibiotics, antihistamines, or steroid creams are options a provider may recommend depending on the cause (Cleveland Clinic). MedlinePlus advises not using more topical steroid, or using it more often, than your provider advises.

What a clinician may do

A provider will examine the skin and ask about your symptoms and the products you use. Cleveland Clinic says a provider can often diagnose an armpit yeast infection by looking at the skin. For contact dermatitis, AAD says dermatologists work to find what is irritating the skin or causing an allergic reaction, treat the rash, and help you avoid the cause. MedlinePlus notes that tests such as a skin biopsy or culture may be used to check for other possible causes.

FAQ

Questions people ask

What causes a rash in the armpit?

Cleveland Clinic lists razor burn, ingrown hairs, irritation from deodorant, soap, or detergent, medicine reactions, and conditions such as contact dermatitis, eczema, psoriasis, heat rash, yeast infection, intertrigo, and folliculitis. A clinician can tell which one you have.

Can deodorant or antiperspirant cause an armpit rash?

Products that touch the skin can cause irritant or allergic contact dermatitis (AAD). Antiperspirant labels say to stop use if a rash or irritation occurs.

How do I know if an armpit rash is a yeast infection?

Cleveland Clinic describes a bright red, intensely itchy rash in the skin folds, sometimes with small spots. A provider can usually diagnose it by examining the skin, and treatment is usually an antifungal.

When should I see a doctor for an armpit rash?

If it worsens, does not improve with treatment, spreads, keeps you from sleeping, or comes with a lump or swollen lymph nodes, severe pain, fever, or signs of infection such as warmth and tenderness (Cleveland Clinic, MedlinePlus).

Can Maxim treat an armpit rash?

No. Maxim makes underarm antiperspirants, which are not a treatment for rashes. If a rash appears where you use any underarm product, stop using it and ask a clinician.

Sources

Educational information, not a diagnosis or medical advice. Sources were opened and read on Nov 6, 2026.

Not sure what your rash is?

A healthcare provider can examine the skin and recommend treatment for the cause. Contact one sooner if the rash spreads, worsens, or comes with fever, a lump, or severe pain.

When to get help Read the sources

Educational information only, not medical advice, diagnosis, or treatment. If you have a rash that worries you, contact a healthcare provider. Maxim products are underarm antiperspirants and are not intended to treat any skin condition.