What is Axillary Fat, and How Can It Be Removed?

Axillary fat is the extra fat that gathers around the armpits, and it often forms a small pouch that can spill past a bra strap or swimsuit. It's sometimes mistaken for axillary breast tissue, which is regular breast tissue that extends into the armpit. Stubborn axillary fat can be removed with liposuction-based treatments like our minimally invasive Armpit and Underarm AirSculpt®, while extra breast tissue is typically treated with surgical excision.

What Is Axillary Fat?

Axillary fat is excess adipose tissue, the medical term for body fat, that builds up around the armpits. It can create a bra bulge or a "flabby" look when you wear fitted clothes. The axilla is simply the medical word for the armpit, so axillary fat and armpit fat mean the same thing.

If you've noticed fullness when you lift your arm or slip on a tank top, you're in good company. People of all weights, ages, and sizes can have extra fat around the chest and underarms. It's even typical to have more fat under one armpit than the other, and it's nothing to be alarmed about.

What Causes Axillary Fat?

Axillary fat usually comes from a mix of genetics, hormones, diet, activity level, age, and posture. Here's a closer look at each one.

Genetics and Fat Distribution

Your genes largely map out where your body stores fat. If your parents tend to carry extra weight in the torso or armpit area, you likely will too. That's why stubborn fat can show up under the arms even when someone is at or near their ideal weight.

Weight Gain

Extra body fat is the most common cause of armpit fat. When your genes favor the upper body, weight you gain is likely to settle around the armpits. That also means efforts to lose weight, like a nutritious diet and exercise, can help reduce the area.

Hormonal Fluctuations

Breast tissue is very sensitive to hormone changes during puberty, pregnancy, and menstruation. Shifts in estrogen or progesterone can make breast tissue swell, and during pregnancy the hormone prolactin enlarges the breasts to prepare for milk production. These changes can make the armpit area look fuller and bulge in certain clothes.

Bra and Clothing Fit

A bra band that's too small can press into soft tissue near the armpits and upper back, pushing skin and fat outward. Wearing tight clothes that don't fit well for long stretches can add to the problem. In some cases, a snug bra or top simply creates the illusion of armpit fat.

If you're curious about the folds that form along the bra line, our guide to armpit rolls and how people treat them goes deeper.

Axillary Fat vs. Axillary Breast Tissue: How to Tell the Difference

Axillary fat and axillary breast tissue can look alike, but they feel different and respond to different triggers. Axillary breast tissue is regular breast tissue that reaches into the armpit, and it's normal and not a health risk. It's one form of accessory breast tissue, which can appear in both men and women along the milk line, a V-shaped path from the front of the armpits down the sides of the chest and abdomen.

How Each One Feels

Axillary breast tissue tends to feel fibrous, meaning firmer and denser, while armpit fat feels softer. Hormone changes can make glandular tissue look and feel heavier at times, which is one reason people confuse it with fat.

How Each One Responds to Weight Loss and Hormones

Glandular tissue mainly responds to hormone shifts like menstruation, pregnancy, and menopause, so it can grow or shrink more quickly. Armpit fat mostly follows changes in your overall weight and health. It tends to change shape more slowly, because weight gain takes time. Weight loss may shrink axillary breast tissue too, though it won't fully disappear.

When to See a Doctor

If you're not sure what's behind the fullness, see a doctor before choosing any treatment, since that exam determines whether you need fat removal or a different approach. Accessory breast tissue can sometimes become a more noticeable mass under the skin during pregnancy or breastfeeding. Any new lump in breast tissue should be checked by a doctor.

Can You Reduce Axillary Fat Without Surgery?

You can shrink axillary fat by lowering your overall body fat, but you can't make your body burn fat from the armpits alone. Nonsurgical fat reduction devices use ultrasound or cold energy, a process called cryolipolysis, to destroy fat cells. Other nonsurgical options include injection lipolysis, radiofrequency lipolysis, and laser lipolysis.

These devices are usually aimed at small bulges on the abdomen, flanks, back, or thighs, and you may need several sessions. Their changes tend to be temporary, because the fat cells empty their contents and aren't physically removed. People who are pregnant or breastfeeding shouldn't have these treatments.

Our guide to invasive vs. non-invasive fat removal compares the options side by side. Consider asking your surgeon whether any of them may suit the armpit area.

Why Spot Reduction Doesn't Work

Spot reduction, the idea that working one body part burns the fat right there, is a myth. Arm and chest exercises build the muscles underneath, but they don't specifically target the fat on top. Fat loss happens gradually across your whole body.

Diet and Exercise Expectations

Losing armpit fat on your own means staying in a calorie deficit, eating fewer calories than you burn, through diet, exercise, or both. Regular cardio plus strength training for the chest, back, and shoulders can help burn fat and tone the area. Even with steady effort, genetics still decide where fat leaves first and where it stays stubborn.

Axillary Fat Removal Options

The best removal option depends on whether the fullness comes from fat, glandular tissue, loose skin, or a mix. Here's how the main approaches compare.

Traditional Axillary Liposuction

Liposuction removes fat through a cannula, a thin tube attached to a suction device. Traditional armpit liposuction often uses general anesthesia, and treating both armpits can take 45 minutes to an hour, with patients going home the same day. Recovery typically includes about 48 hours of rest, no heavy lifting for about 4 weeks, and a compression garment for 4 to 6 weeks to reduce swelling and bruising. Strenuous activity is also off-limits during early recovery.

Liposuction commonly brings bruising, pain, and swelling, and scarring is a possible risk. Other risks include infection, changes in skin sensation, and irregular contours or asymmetries.

How does liposuction compare with an arm lift? An arm lift, or brachioplasty, is surgery for loose or flabby skin in the underarm area, and it uses a scalpel to remove that skin. Its incision can run from just above the elbow to the underarm. It typically takes about 2 hours under general anesthesia, and you'll need to pause upper-body lifting for 4 to 6 weeks.

An arm lift leaves visible scars along the inside of the arm that may extend from the armpit to the elbow. If loose skin sits only near the armpit, a limited-incision brachioplasty keeps the scar to the underarm area. Arm liposuction treats excess fat well but can't do much for significant loose skin, so some people need both.

Surgical Excision for Glandular Tissue

Surgical excision is the primary treatment for extra axillary breast tissue. The surgeon makes an incision around the glandular area and removes the tissue. We don't perform excision, so glandular tissue calls for a surgeon who specializes in breast and body contouring procedures.

Minimally Invasive Fat Removal

Minimally invasive fat removal sits in between traditional surgery and nonsurgical treatments. Armpit and Underarm AirSculpt is our minimally invasive option, designed to permanently remove stubborn underarm fat with no scalpel, no needles, no stitches, and no general anesthesia. It can be done on its own or as part of Arm AirSculpt®, which can also slim the upper arms and front bra rolls.

The fat cells we remove don't grow back, so the treated area keeps less fat going forward. If you gain weight later, the armpits can still grow larger, but other areas tend to collect fat first.

How Armpit and Underarm AirSculpt® Works

Armpit and Underarm AirSculpt removes fat cell by cell through a freckle-sized entry point while you're fully awake. Our device is a thin, rapidly vibrating tool that plucks fat delicately, a bit like picking grapes off a vine. Its patented technology gives our surgeons extra finesse, which matters when sculpting a small area like the underarms.

What to Expect During the Procedure

Here's what happens, step by step:

1. Your surgeon numbs the area with the AirPen, which uses air pressure to deliver numbing solution.
2. A biopsy punch, a small tool that makes a tiny, even opening, creates a two-millimeter entry point.
3. After a local anesthetic is applied, our patented device removes fat and helps tighten skin at the same time.
4. The entry point is left to heal on its own, leaving a mark about the size of a freckle.

Underarm treatment typically uses one entry point on each elbow, one where the bicep meets the forearm, and one for each armpit. The procedure can take as little as 45 minutes. Because you're awake, you can see your results take shape in real time.

To prepare, avoid tobacco, alcohol, fish oil, flax seed, and omega-3 pills for 1 week before and after your procedure. On the day itself, eat beforehand, skip sedating medications, and arrive 30 minutes early.

Recovery Timeline

Most patients return to work within one to two days, with minimal downtime. Here's what a typical arm recovery looks like:

• 24 hours: Go back to work if you feel comfortable, and walk at least 30 minutes a day.
• 48 hours: Showering is OK.
• 1 week: Your first post-op visit checks your entry points.
• 2 weeks: Most workouts can resume.
• 3 weeks: You can remove your compression garment.
• 1 month: Swelling and bruising begin to fade more quickly.
• 3 and 6 months: Follow-up visits, with results fully complete by 6 months and permanent if your weight stays stable.

Strenuous activity isn't recommended right after AirSculpt, so hold off on heavy lifting and strenuous exercise for the first 2 weeks. You can raise your arms whenever you feel ready. Drainage from the entry points is normal and can last anywhere from 1 day to a few weeks.

Bruising and swelling are expected, and pain and scarring are possible risks. Downtime varies with the number of areas treated and the amount of fat removed, so follow the plan your surgeon gives you. If you're comparing recoveries across procedures, our look at tummy tuck recovery tips and the alternatives offers helpful context.

Am I a Candidate for Axillary Fat Removal?

You may be a good candidate if you have stubborn underarm fat that hasn't responded to diet and exercise. As with liposuction, good candidates are usually within 30 percent of their ideal weight, don't smoke, and understand fat removal isn't a weight-loss solution.

Skin quality may matter too, since fat removal alone tends to suit people whose skin has good elasticity. An experienced plastic surgeon can usually judge skin looseness at your consultation. Older patients and people with poor elasticity may see some sagging after a large amount of fat is removed.

For loose skin, AirSculpt+ uses Renuvion® technology through the same freckle-sized entry points. Renuvion delivers helium plasma and radiofrequency energy under the skin to heat tissue and prompt skin contraction. Men can treat the armpit and upper arm area too. If the fullness turns out to be glandular breast tissue, excision is the better fit. Your candidacy is confirmed during a free consultation.

Axillary Fat FAQs

What is the difference between axillary fat and accessory breast tissue?

Axillary fat is soft excess fat around the armpit, while accessory breast tissue is breast tissue that extends into the armpit and feels more fibrous. Breast tissue mainly responds to hormone changes like pregnancy and menopause. Armpit fat mostly follows changes in your overall weight and health. A doctor's exam determines which one you have, and that decides whether fat removal or a different treatment fits best.

Can axillary fat be removed without surgery?

You can reduce axillary fat by lowering your overall body fat with diet and exercise, but you can't target the armpit alone. Nonsurgical devices that use cold or ultrasound energy are usually aimed at small bulges on the abdomen, flanks, back, or thighs, and you may need several sessions. Their changes tend to be temporary, because the fat cells empty their contents and aren't physically removed. It may help to talk through your goals with your surgeon.

Is axillary fat the same as armpit fat?

Yes, axillary fat and armpit fat are two names for the same thing, since the axilla is the medical term for the armpit. It's excess fat that builds up around the armpits and can create a bulge near your bra line or in fitted tops. It's sometimes confused with axillary breast tissue, which feels more fibrous and responds to hormones. An exam with a doctor may help clarify which one you're dealing with.

What removal options exist?

Axillary fat can be removed with traditional liposuction or with minimally invasive Armpit and Underarm AirSculpt, which works through freckle-sized entry points while you're awake. Extra glandular breast tissue is typically removed with surgical excision. If loose skin is the main concern, AirSculpt+ skin tightening may be preferred to a fully invasive arm lift. Your surgeon will recommend the right path during your consultation.

Ready to Talk to a Specialist?

Armpit fat is a common concern, and you don't have to figure out the cause alone. During a free consultation, a surgeon will assess the area and help determine whether fat removal or a different treatment fits you. We'll talk through your goals, your skin, and a plan built around your body.

Book a Free Consultation at our office nearest you, or View Real Results to see what our patients have experienced.