The best treatment for heat rash includes keeping the skin cool, using calamine lotion, and applying hydrocortisone cream to reduce inflammation.
Struggling with itchy, prickly heat rash after sweating? You’re not alone. This irritating skin condition flares up when sweat gets trapped, causing red bumps, stinging, and discomfort—especially in hot, humid weather or under tight clothing.
The right heat rash treatment can soothe irritation fast and prevent future breakouts. In this guide, we’ll cover proven remedies like calamine lotion, cooling techniques, and when to see a doctor. For severe cases, explore advanced skincare solutions.
Key Takeaways
- Cool & dry skin is critical—avoid sweating and wear breathable fabrics
- Hydrocortisone cream (1%) reduces inflammation; calamine lotion relieves itching
- Prevent recurrence by staying in air-conditioned spaces and patting sweat away
What Causes Heat Rash?
Heat rash (miliaria) occurs when sweat ducts become blocked, trapping perspiration under the skin. This triggers inflammation, leading to red bumps or blisters. There are three main types:
| Type | Appearance | Symptoms |
|---|---|---|
| Miliaria crystallina | Clear, fluid-filled bumps | Mild; no itching |
| Miliaria rubra (prickly heat) | Red, inflamed bumps | Itching/stinging |
| Miliaria profunda | Firm, flesh-colored lesions | Painful; rare |
According to dermatologist Dr. Lisa Kellett, “Heat rash is common in infants due to immature sweat ducts, but adults in humid climates or those wearing occlusive clothing are equally at risk.“
Top 5 Heat Rash Treatments
1. Cool Compresses
Apply a damp, cool cloth for 15-minute intervals to reduce swelling. Avoid ice directly on skin—wrap it in a towel first.
2. OTC Remedies
- Calamine lotion: Dries oozing bumps and relieves itch (NIH study)
- Hydrocortisone cream (1%): Reduces inflammation (use sparingly)
- Colloidal oatmeal baths: Soothe irritated skin
3. Wear Loose Clothing
Opt for 100% cotton or moisture-wicking fabrics. Avoid synthetic materials like polyester that trap heat.
4. Stay Dry
Pat skin dry after sweating—don’t rub. Use talc-free powder in skin folds (e.g., under breasts).
5. Adjust Your Environment
Use fans or air conditioning to maintain a cool, dry atmosphere. Sleep with lightweight bedding.
When to See a Doctor
Most heat rashes resolve in 3–4 days, but seek medical help if:
- Rash lasts over a week
- Pus-filled bumps appear (sign of infection)
- Fever or chills develop
FAQ
Can heat rash spread?
Yes—if sweat continues to accumulate, it can expand to nearby areas. Keep skin dry to prevent spreading.
Is heat rash contagious?
No. It’s caused by blocked sweat ducts, not bacteria or viruses.
Does baby powder help?
Cornstarch-based powders may absorb moisture, but avoid talc (linked to lung irritation).
Final Thoughts
Heat rash thrives in hot, sweaty conditions, but simple strategies like cooling the skin and wearing breathable fabrics offer relief. For persistent cases, consult a dermatologist to rule out infections or eczema.
