Sweat Rash & Chafing: What It Looks Like, Causes, and When to See a Doctor

What Does Sweat Rash and Chafing Look Like?

Sweat rash (also called intertrigo) and chafing usually appear as red, raw, or sore patches of skin. These rashes most often develop in areas where skin folds or rubs together, such as the groin, inner thighs, underarms, and under the breasts. The affected skin may feel tender, burn, or itch, and sometimes develops a moist appearance. If a secondary infection occurs, you might notice increased redness, swelling, oozing, or an unpleasant odor.

Why Sweat Rash and Chafing Happen

• Moisture: Sweat and trapped moisture soften the skin, making it more prone to irritation.
• Friction: Skin rubbing against skin or clothing breaks down the skin’s protective barrier.
• Heat: Warm environments increase sweating and friction, raising the risk of rash.
• Clothing: Tight, non-breathable fabrics can worsen moisture and friction.

How to Prevent and Soothe Sweat Rash

• Keep at-risk areas clean and dry. Gently pat skin dry after sweating or showering.
• Wear loose, breathable clothing made from cotton or moisture-wicking fabrics.
• Use barrier creams or powders to reduce friction in vulnerable spots.
• Change out of damp clothing quickly, especially after exercise.

When to See a Doctor

Most mild sweat rashes and chafing can be managed at home, but you should see a doctor or dermatologist if:

• The rash is very painful, blistering, or oozing.
• The area is rapidly spreading or not improving after a few days of self-care.
• You develop a fever or feel unwell.
• You suspect a secondary infection (increased redness, swelling, pus, or foul smell).

If you're unsure about your rash, you can check your skin with Rash Detector by uploading a photo for an instant AI report. Always follow up with a healthcare professional for diagnosis and treatment, especially if symptoms are severe or persistent.