Chafing happens when repeated friction wears down your skin’s protective outer layer, leaving it raw, red, and stinging. The fix comes down to three things: reducing friction, controlling moisture, and choosing the right materials for your skin and clothing. Here’s how to handle each one.
Why Moisture Makes Everything Worse
Friction is always the root cause of chafing, but moisture is its accelerant. Wet skin is softer, more fragile, and creates more drag against fabric or other skin. Sweat, rain, pool water, even humidity can turn a mildly irritating seam into a painful abrasion over the course of a workout or a long day. This is why chafing tends to flare up in summer, during exercise, or in skin folds where sweat collects and can’t evaporate.
Understanding this two-part problem (friction plus moisture) is what makes prevention actually work. You need strategies that address both at the same time.
Choose Fabrics That Don’t Trap Sweat
Cotton is the single worst fabric for chafing-prone areas. It absorbs about 8.5% of its weight in moisture, which means a cotton shirt or pair of underwear becomes a damp, heavy layer clinging to your skin. That trapped moisture softens your skin and increases friction with every movement.
Polyester is the opposite extreme, absorbing just 0.4% of its weight in moisture. It’s the most common fabric in sweat-wicking athletic wear because water moves across its surface rather than soaking in, keeping the fabric light and your skin drier. Nylon falls in between at about 4% moisture absorption. It attracts just enough water to pull sweat away from your skin but not enough to get waterlogged, which is why it’s a popular choice for performance clothing too.
Spandex, found in leggings and bike shorts, has moderate wicking ability on its own. You’ll never find a garment made of pure spandex. It’s always blended with polyester or nylon, and it’s the blend that determines how well it handles sweat. When shopping for chafe-resistant clothing, look for polyester or nylon blends with enough spandex for a snug, smooth fit that doesn’t bunch or shift.
Use a Barrier Between Skin Surfaces
For areas where skin rubs against skin (inner thighs, underarms, under the chest), a lubricant or balm creates a slippery layer that prevents the friction from building up. You have two main options.
Petroleum-based products like plain petroleum jelly are cheap and widely available. They create an effective barrier but tend to break down faster with heavy sweating and can feel greasy. They also stain fabrics.
Silicone-based anti-chafing balms last longer because they’re harder to wash off, which means sweat doesn’t dissolve them as quickly. They feel lighter on the skin and tend to work better for extended activity like long runs or all-day hikes. Many come in stick or roll-on form for easy application.
Apply your barrier product before you start moving, not after irritation begins. Reapply during long activities, especially if you’re sweating heavily.
Powders: What Works and What to Avoid
Absorbing moisture before it can soften your skin is another effective prevention strategy. Cornstarch is the most popular powder option. It’s plant-based, absorbs moisture well, and reduces friction. One caveat: cornstarch can encourage yeast growth in warm, moist areas like skin folds, so if you’re prone to yeast infections, it may not be ideal for your groin or under your chest.
Tapioca starch is a good alternative in that case. It’s similarly absorbent and hypoallergenic but doesn’t promote yeast growth, making it a better choice for sensitive or infection-prone skin.
Talcum powder was once the go-to, but it carries real safety concerns. Talc can be contaminated with asbestos, and its use has been linked to ovarian cancer and mesothelioma. Plant-based starches do the same job without that risk.
Compression Shorts for Inner Thigh Chafing
Inner thigh chafing is one of the most common types, and compression shorts are the most reliable fix. They create a smooth, snug layer that prevents skin-on-skin contact entirely. If you don’t want to wear compression shorts as your outer layer, wearing them underneath regular shorts or pants works just as well.
Look for a length that covers the area where your thighs make contact. For most people, a 5 to 7 inch inseam does the job. The fit should be snug enough that the fabric stays in place and doesn’t ride up, since bunching fabric creates exactly the kind of friction you’re trying to avoid. Polyester or nylon blends will keep the area drier than cotton-blend options.
Preventing Nipple Chafing
Nipple chafing is especially common in distance runners, where thousands of stride cycles create repetitive friction between a shirt and the chest. The standard prevention method is applying adhesive covers or tape directly over the nipples before a run. Products designed specifically for this purpose use clear, skin-friendly adhesives that stay in place through sweat and movement. Simple medical tape or small adhesive bandages also work, though they may peel off during longer efforts. A well-fitting synthetic shirt reduces the problem too, since loose or cotton shirts create more abrasion with each step.
Treating Skin That’s Already Chafed
Once chafing has happened, your first priority is to stop the friction. Change out of wet or irritating clothing and gently clean the area with lukewarm water. Avoid hot water and harsh soaps, which strip away the little moisture your damaged skin has left and increase the sting.
After cleaning, let the area air dry and apply a protective ointment. Zinc oxide cream is effective here. It forms a physical barrier over raw skin, protects it from further moisture and irritation, and is gentle enough that it’s used on diaper rash in infants. Petroleum jelly works too if zinc oxide isn’t available. The goal is to keep the damaged skin covered and protected while it heals.
Avoid re-exposing the area to friction while it’s healing. If that means skipping a run or wearing looser clothing for a few days, it’s worth it. Minor chafing typically heals within a couple of days if you keep the area clean and protected. More severe cases with broken skin or blistering can take a week or more.
Signs of Infection to Watch For
Chafed skin is an open door for bacteria and fungi. Most chafing heals on its own, but if the area gets infected, it won’t improve without treatment. Watch for these warning signs:
- Pus or fluid leaking from the irritated area
- Increasing redness that spreads outward from the original spot
- A red streak radiating away from the wound
- Yellowish crusting over the surface
- Pain that gets worse after the first two days instead of improving
- Swelling that increases rather than going down
- Fever of 100.4°F or higher
Some redness and tenderness around chafed skin is normal and expected. The key distinction is whether symptoms are improving or getting worse. If pain or swelling escalates after 48 hours, or if you see pus or spreading redness, that’s a sign the skin has become infected and needs medical attention.
Quick Prevention Checklist
Chafing prevention works best as a system rather than a single fix. Combining several strategies gives you the most protection:
- Wear synthetic fabrics (polyester, nylon blends) instead of cotton in friction-prone areas
- Apply a silicone-based balm to skin-on-skin contact zones before activity
- Use compression shorts to prevent inner thigh contact
- Keep skin dry with tapioca or cornstarch powder in sweat-prone folds
- Ensure proper fit so clothing doesn’t bunch, shift, or rub at seams
- Cover nipples with adhesive strips or tape for long runs
- Reapply lubricant during extended activities lasting more than an hour