Sweat rash treatment

What is sweat rash?

Heat rash develops when sweat glands become blocked and sweat gets trapped. The symptoms include small raised spots, an itchy or prickly feeling and mild swelling. Some spots contain fluid. The rash looks red on white skin but can look grey or white, or be harder to see, on brown or black skin. Adults and children often have the same symptoms. Heat rash can appear anywhere and spread across your skin, but you cannot pass it to someone else.2

How do you treat sweat rash in adults?

1. 1Move somewhere cooler, ideally an air conditioned space, and remove clothing covering the affected skin.
2. 2Gently wash the area with cool or lukewarm water. Pat it dry rather than scrubbing.
3. 3Leave the area uncovered where practical, or wear clean, loose clothing that does not rub.
4. 4Use a cool washcloth when the prickly feeling bothers you.
5. 5Pause workouts and other activities that cause heavy sweating until the rash has gone.

Cooling and drying should help the rash clear within a few days. Continue taking cool showers to remove sweat while it heals. Avoid scratching, which can delay healing and break the skin, allowing infection. Skip creams, ointments and powders that could block sweat from escaping. A cooling plan does not need a shopping basket full of products.1

What can you use for sweat rash?

Start with a cold damp cloth or an ice pack wrapped in a tea towel, applied for up to 20 minutes. Tap or pat the rash instead of scratching, and avoid perfumed shower gels and creams. If you need more itch relief, a pharmacist can suggest calamine lotion, antihistamine tablets or hydrocortisone cream. Ask which option suits you and how to use it. Children under 10 need advice from a doctor before using hydrocortisone for heat rash.2

Wear loose cotton clothing, take cool baths or showers, and drink enough fluid to avoid dehydration. Lightweight bedding belongs in the plan, even if the duvet would prefer to remain in charge. See a GP if the rash does not improve after a few days, or if your baby has a rash and you are worried.2

Who is more likely to get heat rash?

Heat rash often forms under clothing and in skin folds where airflow is limited. In adults, common areas include the arms, back, chest, beneath the breasts and inner thighs. Risk increases with intense activity in heat, hot or humid weather, tight clothing, fever, excessive sweating and bedrest. Some medicines, including beta blockers, clonidine and opioids, can make sweat glands more active. Babies have a higher risk because their sweat glands and temperature control are still developing. Seek medical advice for pain, intense itching or concern that heat is not the cause.1

How do you treat sweat rash on your neck?

The neck is a common place for heat rash. For itchy clusters of tiny bumps, calamine lotion can soothe discomfort; choose lotion rather than calamine powder or cream. Avoid scratching, because continued scratching can worsen itching. An itchy neck is not always heat rash, though. Soap, laundry detergent, synthetic fabrics, hair dye, fragranced skincare and jewellery metals can cause contact dermatitis, a skin reaction to an irritant or allergen. If the rash followed a new body wash, perfume or necklace, stop using the new item and watch whether symptoms settle.4

Dry, itchy neck skin without a rash or discoloration can benefit from a fragrance free moisturizer. That is a different situation from trapped sweat, so do not assume every itchy neck needs more cream. If you have eczema or psoriasis, ask your clinician before adding home remedies or skincare products because some ingredients can worsen irritation. Get medical help if treatment makes symptoms worse, scratching opens the skin, or itching disrupts sleep. Swelling, crusting or oozing pus also need assessment. Persistent neck itching lasting longer than a couple of weeks needs a review.4

What if the rash is contact dermatitis?

Avoiding the trigger is the main treatment for contact dermatitis. A dermatologist can examine the rash, ask when it appears and review products or exposures at home and work. Bring details of your skin, hair and nail products, including products you apply to someone else. Patch testing can help identify an allergy when the cause is unclear. Treatment can include prescribed medication and cool compresses for discomfort. If you already have medication for diagnosed dermatitis, follow its directions rather than stopping just because the rash looks better. Tell your dermatologist if treatment does not stop new rashes.5

What if sweating at work keeps bringing the rash back?

Hot, humid working conditions can trigger heat rash, chafing, softened wet skin and bacterial or fungal infection. A recurring workplace rash therefore needs its cause identified, not just another round of cream. Irritant dermatitis can follow repeated physical or chemical damage, and gloves, rings or watches can trap irritants against skin. A contact allergy can also develop after years of tolerating the same material. Work with your employer to identify exposures and reduce them through suitable ventilation, task rotation or safer materials. Treatment should match the diagnosis; steroids, moisturizers and antibiotics serve different purposes and should be selected by a medical professional.6

Protective equipment adds another complication: it can prevent sweat from evaporating and make you overheat. Sweating inside gloves and rubbing from equipment can also cause irritant dermatitis, while equipment materials can cause allergic reactions. Cooling measures are needed immediately if signs of heat illness develop. Reducing irritation and time spent in equipment can help prevent skin damage, but protective equipment must still be selected, fitted and removed using the correct workplace protocol. Arrange changes through the workplace safety process rather than compromising protection.3

When does a rash need urgent medical help?

• Seek medical attention for a rash covering most of your body, spreading rapidly, causing pain, or occurring with fever or illness.
• Get assessed if the rash develops blisters, open sores or raw skin, or involves your eyes, lips, mouth or genital skin.
• Seek care for possible infection, including pus, yellow or golden crusts, swelling, warmth, pain or an unpleasant smell.
• Get emergency medical care immediately if you have trouble breathing or swallowing, or your eyes or lips swell.