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under the breasts
Skin issues
Quick answer: Redness, chafing, itching, and irritation in the fold under the breasts are common. The trouble starts when moisture, friction, and heat build up in a skin fold that rarely gets any air. The right bra size, moisture-wicking fabric, and letting the skin dry properly are the three things that make the biggest difference. For persistent symptoms, see a doctor.
Introduction
This is one of the most common issues women deal with, and one of the least talked about. The skin under the breasts turns red and sore. The fold itches. The band leaves marks that don't fade. Maybe you've started avoiding certain clothes, or you feel an irritation you don't quite want to mention to anyone.
You're far from alone, and it's rarely about hygiene. It comes down to how skin behaves where two surfaces meet, where it gets warm, and where moisture struggles to evaporate. Add a bra in the wrong size, or in a fabric that traps sweat, and you've got the perfect conditions for trouble.
This guide covers why it happens, what you can do yourself, and what to look for when choosing underwear. We sell bras, so we're not neutral, but we've worked with what sits closest to the skin since 1937, and we know a thing or two about what chafes, and why.
Why does this happen right under the breasts?
Three things work together, and they reinforce each other:
Moisture. The fold under the breasts is one of the warmest, most enclosed areas of the body. Sweat forms there but struggles to evaporate. The skin softens and becomes more sensitive.
Friction. Skin against skin, or fabric against skin, rubs with every movement. Softened skin tolerates far less friction than dry skin.
Heat and limited airflow. A tight fabric or a band that sits close all day traps both heat and moisture. That creates a favorable environment for the microorganisms naturally present on the skin, yeast in particular.
Certain factors raise the risk: a larger or heavier bust, heavy sweating, warm weather, diabetes, being overweight, sensitive or thin skin, and the changes the body goes through during menopause, when estrogen levels drop and the skin becomes thinner and drier.
The most common issues
Chafing and friction irritation
Redness, soreness, and sometimes small skin breaks where the band, underwire, or cup edge sits against the skin. Usually caused by the wrong size: a band that's too tight or too loose, an underwire resting on breast tissue instead of the ribcage, or a cup that's too small.
Sweat-related irritation
Damp, itchy skin, sometimes with small raised bumps. Most common in summer, during exercise, or during hot flashes. Tight synthetic fabric that doesn't wick moisture away makes it worse.
Intertrigo (inflammation in skin folds)
Redness, stinging, and sometimes wetness right in the fold itself, often with a clear border that follows the shape of the skin fold. Described in clinical sources as a common condition, especially under the breasts. It's an inflammation caused by moisture and friction, not an infection in itself, but it can easily become infected.
Yeast infection (candida)
Itching, redness, sometimes flaking at the edges or small satellite bumps outside the red area. Develops in the warm, moist environment. Common, and often recurring if the root cause, the moisture, isn't addressed.
Reaction to fabric or metal
Itching and redness exactly where a clasp, hook, or underwire tip sits. Can be a contact reaction to nickel or to detergent residue in the fabric. That's why we use nickel-free hardware in our bras and recommend fragrance-free detergent.
What you can do yourself
Check your bra size. The body changes, and your size changes with it. A band that rides up the back, an underwire that presses, or a cup that cuts in are all signs your size no longer fits. Remeasure, or use sister sizes to find the right combination.
Let your skin dry properly. After showering, pat the fold dry instead of rubbing it. A hairdryer on the coolest, lowest setting works well if it's hard to reach.
Change your bra every day. A bra worn all day has absorbed moisture. Let it rest and air-dry before wearing it again.
Choose moisture-wicking fabric. Cotton absorbs moisture but holds it against the skin. Moisture-wicking fabric instead moves moisture out to the fabric's surface, where it can evaporate.
Sleep without a bra if you can. Eight hours without pressure and friction gives the skin a chance to recover. If you prefer to wear something, choose a soft top or a wireless style with no rigid construction.
Wash with fragrance-free detergent and rinse thoroughly. Detergent and fabric softener residue in the fabric is a common cause of irritation for anyone who already has sensitive skin. We recommend skipping fabric softener entirely when washing our products.
Address it early. An issue left untreated becomes harder to clear up. If you suspect a fungal infection, over-the-counter options are available at the pharmacy, and pharmacy staff can advise you.
When should you see a doctor?
Contact your doctor or local healthcare services if:
symptoms don't improve after a couple of weeks of home care
the skin is broken, weeping, or has an odor
you have a fever, or the area feels warm and swollen
the issue keeps coming back
you have diabetes or a weakened immune system
This guide is general information and doesn't replace medical advice.
What to look for in a bra for sensitive skin
The right band size. The band should sit horizontal and do most of the work, without cutting in. It's the single most important factor against chafing.
Moisture-wicking fabric that carries sweat away from the skin instead of holding it there.
Soft construction with no rough seams, scratchy lace, or hard edges against the skin.
Molded cups or a soft underwire for a smooth surface with no pressure points.
Nickel-free hardware on hooks, clasps, and underwire tips.
A wide size range, so you can actually find your combination instead of settling for the closest match.
What Swegmark does about it
Swegmark was founded in 1937 in Borås. Since then, we've worked on the same thing: garments closest to the body, for women who want to be able to forget they're wearing them. Comfort has never been a trend for us, it's been the job from the start.
With 85 years of fit expertise, we know that most skin issues start with the fit. That's why we spend time on band construction, underwire selection by size, and edges that lie flat. We work with a wide size range because a bra that almost fits is a bra that chafes. And we choose materials and details with the skin in mind: OEKO-TEX®-certified fabrics tested free of harmful substances, nickel-free metal parts, and smooth surfaces.
The Cool & Dry collection came out of exactly this kind of problem. It was developed by women in midlife, for women in the same situation, starting from the fact that moisture against the skin is uncomfortable all day and a problem in the long run.
Our recommendations
Cool & Dry Bra
Moisture-wicking fabric in the cups, a soft band, and a smooth surface against the skin. The range is largely soft, wireless styles with molded cups that give shape without any rigid construction pressing in. Underwire styles also available. Wide size range.
Cool & Dry Top (Essence)
A soft, moisture-wicking base layer with a smooth surface against the skin. Works under clothes during the day and as sleepwear at night, for anyone who wants something on top but wants to skip bands and cup edges.
Cool & Dry Briefs
Same technology as the bra, with flat seams against the skin. The long-leg style is especially popular with anyone who chafes on the inside of the thighs under skirts and dresses.
Frequently asked questions
Is redness under the breasts dangerous?
Usually not. Mild redness and irritation are common and clear up with home care. See a doctor if the skin is broken, weeping, has an odor, or if symptoms don't improve within a couple of weeks.
Can a bra cause a fungal infection?
Not directly, but a bra in a fabric that traps moisture against the skin creates the environment where yeast thrives. Switching to moisture-wicking fabric and changing your bra daily lowers the risk.
Is cotton best for sensitive skin?
Cotton is soft and breathable, but it absorbs moisture and holds it against the skin. If you sweat heavily or have trouble in the skin fold, a moisture-wicking fabric often works better.
Should I stop wearing underwire bras?
Not necessarily. An underwire that sits correctly, against the ribcage and outside the breast tissue, shouldn't chafe. If it does, it's usually the size. But during a period of irritated skin, a soft wireless style can give the skin some peace.
How often should I remeasure my bra size?
About once a year, and always after weight changes, pregnancy, breastfeeding, or during menopause.
Can I sleep in a bra?
That's fine, but skin benefits from a break from pressure and friction. If you're having issues, try sleeping without one, or in a soft top instead.
Sources
Royal United Hospitals Bath NHS Foundation Trust, patient information on intertrigo
NHS, fungal skin infections
1177 Vårdguiden (Swedish national healthcare guide), skin fungal infections
Internetmedicin, intertriginous dermatitis
DermNet, intertrigo and candida intertrigo