Chafing is skin damage from repeated friction — skin rubbing against skin, or against clothing — usually made worse by heat and moisture (sweat). The friction wears away the skin's protective surface, leaving it red, raw, and stinging. It's most common on the inner thighs, underarms, groin, under the breasts, and anywhere a waistband, bra, or seam rubs, and it flares in hot weather, during exercise, and with tight or rough fabrics.

How do you stop chafing fast?

First, reduce the friction and moisture. Gently clean the area with water, pat it fully dry, and apply a protective barrier like plain petroleum jelly to cut the rubbing and let skin heal. Switch to loose, moisture-wicking clothing, and give the raw area a rest from whatever activity caused it if you can. Most mild chafing settles in a few days once the friction stops. If skin is broken, keep it clean and watch for signs of infection.

What's the best way to prevent chafing?

Keep the area dry and reduce rubbing. Wear moisture-wicking, well-fitting clothing and avoid cotton for workouts (it holds sweat). Apply an anti-chafing balm, petroleum jelly, or a barrier stick to friction-prone spots before activity; some people prefer a light powder to absorb moisture. Longer fitted shorts under skirts or loose shorts can stop inner-thigh chafing, and a well-fitted bra reduces underarm and under-breast rubbing.

When should I see a doctor about chafing?

See a healthcare professional if the raw area isn't healing after several days, if it becomes increasingly red, warm, swollen, painful, or starts oozing or crusting (possible infection), or if a rash in a skin fold keeps coming back, itches or burns intensely, or has a distinct odor (which can signal a yeast or bacterial infection needing prescription treatment). People with diabetes, obesity, or a weakened immune system are more prone to skin-fold infections and should have persistent rashes checked promptly.

Chafing, Explained: Why Skin Rubs Raw & How to Prevent It

Q: What's the difference between chafing and intertrigo?

They're on a spectrum. Chafing is the friction irritation itself. Intertrigo is inflammation in skin folds (groin, under the breasts, belly folds, underarms) driven by that same friction plus trapped heat and moisture — and it's prone to a secondary infection with yeast (candida) or bacteria, which can make it itch, burn, weep, or smell. Persistent, spreading, or clearly infected skin-fold rashes are worth a doctor's evaluation, because they often need an antifungal or antibacterial, not just a barrier cream.

Anyone who's finished a long walk, a run, or a hot summer day with raw, burning inner thighs knows chafing the moment it happens. It's one of the most common — and most preventable — warm-weather skin problems. Here's why skin rubs itself raw, how to prevent it, and the point at which simple chafing turns into something that needs treatment.

What chafing is

Chafing is skin damage from repeated friction — skin against skin, or skin against clothing — and it's amplified by heat and moisture. Sweat softens the skin's protective surface and increases drag, so rubbing that would be harmless on cool, dry skin instead wears the surface down. The result is skin that's red, raw, tender, and stinging, sometimes with a rash or broken skin.

Classic hot spots: inner thighs, underarms, groin, under the breasts, and anywhere a waistband, bra band, or seam presses and rubs. Long-distance athletes famously get it in unexpected places too. The common thread is friction + sweat + time.

How to prevent it

Prevention comes down to two levers: less friction and less moisture.

Reduce the rub. Apply a barrier to friction-prone areas before activity — plain petroleum jelly is a dermatologist-recommended, inexpensive option, and dedicated anti-chafing balms and sticks work the same way (AAD).
Dress smart. Wear moisture-wicking, well-fitting clothing. Avoid cotton for exercise — it soaks up sweat and dries slowly. Fitted shorts under a skirt or dress prevent inner-thigh chafing; a properly fitted bra reduces underarm and under-breast rubbing.
Stay dry. Keep sweat-prone folds as dry as you can; some people use a light powder to absorb moisture. Change out of damp, sweaty clothes promptly.

How to soothe skin that's already chafed

Clean gently. Rinse the area with water and pat it completely dry — don't rub.
Protect it. Apply a layer of petroleum jelly (or a similar barrier) a couple of times a day to reduce ongoing friction and help skin heal.
Rest the area. Give it a break from the activity or clothing that caused it, if you can.
Leave it alone otherwise. Most mild chafing heals within a few days once the friction stops.

When chafing becomes intertrigo

Chafing in a skin fold — where two skin surfaces stay pressed together, warm and damp — can tip into intertrigo: inflammation of the fold that's prone to a secondary infection with yeast (candida) or bacteria (StatPearls). Warmth, moisture, friction, and poor airflow are exactly the conditions these organisms love, which is why intertrigo favors the groin, under the breasts, belly folds, and underarms (DermNet).

Tell-tale signs it's more than plain chafing: the rash itches or burns, weeps or crusts, has a distinct odor, keeps coming back, or has small satellite spots at the edges (a clue for yeast). Intertrigo often needs an antifungal or antibacterial treatment, not just a barrier cream — so it's worth having it looked at.

When to see a doctor

See a healthcare professional if:

The raw area isn't healing after several days of good care.
It becomes increasingly red, warm, swollen, painful, or starts oozing or crusting — signs of infection.
A skin-fold rash keeps returning, itches or burns intensely, or smells — it may be a yeast or bacterial infection that needs prescription treatment.
You have diabetes, obesity, or a weakened immune system — you're more prone to skin-fold infections, so get persistent rashes checked early.

Keeping the skin barrier healthy in general helps too; if your skin is easily irritated, see how to repair your skin barrier. And the same summer habits that prevent chafing — staying cool and dry, breathable fabrics — also cut down on heat rash and athlete's foot.

Not sure whether a raw, rubbed patch is simple chafing or a skin-fold infection that needs treatment? A dermatrix.life skin assessment reviews photos you upload and returns a private, plain-language summary of what it sees. It's informational only, not a diagnosis, and never a substitute for a professional. See how it works.