Most Likely Causes (Ranked)
The groin and pubic area contains a high concentration of apocrine sweat glands — the glands responsible for body odor. Unlike the eccrine glands that produce mostly water and salt, apocrine glands produce a protein-rich secretion that bacteria on the skin surface metabolize into short-chain fatty acids and thioalcohols. The resulting smell is musky, slightly acidic, and body-odor-like. This is amplified in the pubic area because the region stays warm and moist under clothing, clothing restricts airflow, and hair traps moisture and bacteria. This is normal human physiology — but hygiene practices, clothing choices, and shaving/grooming habits significantly affect intensity.
Candida yeast normally lives on the skin in small numbers without causing problems. When conditions shift — from antibiotic use, tight synthetic clothing, hormonal changes, or immunosuppression — it overgrows and causes an infection. Genital yeast infections typically present with a thick, white, cottage-cheese-like discharge (if in the vaginal canal), intense itching, and a characteristic yeasty, bread-like, or slightly sweet smell. In skin folds including the groin area (intertrigo), yeast overgrowth produces a musty-sour smell with visible reddening and sometimes a rash at the fold. Men can develop yeast infections under the foreskin (balanitis) with similar symptoms.
Bacterial vaginosis is the most common cause of abnormal vaginal odor in women of reproductive age. It's caused by an imbalance in the vaginal microbiome — beneficial Lactobacillus bacteria decrease while Gardnerella vaginalis and other anaerobic bacteria increase. The anaerobic bacteria produce trimethylamine and other amines, causing the characteristic strong fishy smell that's most pronounced after sex (when semen raises vaginal pH and releases the amines) or during menstruation. BV is not an STI, though sexual activity can be a trigger. Many women with BV have no symptoms other than the odor and a thin grayish discharge.
Trichomoniasis, a parasitic STI, can cause a strong, foul-smelling yellow-green vaginal discharge with associated itching and burning. Other STIs including gonorrhea can produce changes in genital odor, though they more commonly present with other symptoms. It's important to distinguish between BV (common, non-STI, treatable OTC) and STIs (require specific treatment and partner notification). If there's any possibility of an STI, a clinic or doctor visit is appropriate.
While over-washing the genitals is also problematic (it disrupts the natural microbiome, especially in women), inadequate hygiene — particularly infrequent changing of underwear, wearing non-breathable fabrics, or not washing the outer genital area (vulva, not vaginal canal) and inner thighs — allows bacteria and sweat compounds to accumulate. A day's worth of apocrine sweat absorbed into synthetic underwear, sitting at body temperature, produces significant odor.
Intertrigo is a rash that occurs in skin folds — the groin, inner thighs, and under the abdomen — where skin-on-skin friction, moisture, and heat create conditions for bacterial and yeast infection of the skin itself. It produces a raw, red, sometimes oozing rash with a strong, sour, or cheesy smell. Hidradenitis suppurativa (HS) is a chronic inflammatory condition affecting apocrine gland-rich areas including the groin; it causes recurrent painful nodules, abscesses, and scarring that produce a strong, distinctive smell from pus and tissue damage. HS requires medical treatment.
How to Fix It
Proper Hygiene Technique for the Pubic Area
FreeMost cases of normal odor respond to hygiene improvement.
- 1Wash the external pubic area (the skin, outer vulva, groin folds, and inner thighs) daily with mild, unscented soap.
- 2For women: do NOT wash inside the vagina (vaginal canal). The vagina is self-cleaning; internal washing with soap or douches disrupts the natural microbiome and is a major cause of BV.
- 3Pay specific attention to skin folds — the inner thigh crease and pubic fold where skin contacts skin. These trap moisture and bacteria most effectively.
- 4Rinse thoroughly to remove all soap residue.
- 5Dry completely before dressing — moisture in skin folds promotes bacterial and yeast growth. Pat dry; don't rub.
- 6For pubic hair: if trimmed or present, wash as you would hair. Long dense pubic hair traps more bacteria and sweat than trimmed hair.
Choose Better Underwear and Clothing
$10-40 for new underwearFabric choice significantly affects pubic area odor.
- 1Switch to 100% cotton underwear or underwear with a cotton gusset. Cotton breathes and wicks moisture away from skin; synthetic fabrics trap heat and moisture and develop their own bacterial odors.
- 2Change underwear daily at minimum. After exercise: change immediately.
- 3Avoid very tight underwear and pants that restrict airflow and increase moisture in the groin area.
- 4For people prone to groin moisture: moisture-wicking athletic underwear (specifically designed for the purpose) performs better than regular cotton in high-activity settings.
- 5Wash underwear in hot water (130°F) with your regular detergent to kill bacteria. Adding 1/2 cup white vinegar to the wash helps with persistent odors.
Treat a Yeast Infection
$10-20 OTCOTC antifungals are highly effective for uncomplicated yeast infections.
- 1For skin/groin yeast infections: apply OTC antifungal cream (clotrimazole 1%, miconazole) twice daily to the affected area for 7-14 days. Continue for 2 days after symptoms resolve.
- 2For women with vaginal yeast: OTC vaginal antifungal creams (Monistat, generic miconazole or clotrimazole) treat uncomplicated infections effectively. Follow package directions.
- 3Keep the area dry during treatment — moisture promotes yeast growth. Use a hair dryer on low setting to dry skin folds after bathing.
- 4Wear loose, breathable clothing during treatment.
- 5If symptoms don't improve within 1 week or recur frequently (3+ times per year), see a doctor — you may have a resistant strain or a misidentified condition.
See a Doctor for BV or STI
$0-150 depending on insuranceBV and STIs require prescription treatment and professional diagnosis.
- 1Schedule an appointment with a gynecologist, primary care physician, or sexual health clinic.
- 2Describe the smell and discharge characteristics accurately. For BV, the fishy smell intensified by sex is very specific and usually sufficient for clinical diagnosis without extensive testing.
- 3BV treatment: oral metronidazole (antibiotics) for 7 days is the standard treatment. Topical vaginal metronidazole or clindamycin gel are alternatives. Recurrent BV may require longer treatment or a different approach.
- 4For STI testing: request a full sexual health panel including gonorrhea, chlamydia, trichomoniasis, and syphilis. Many health departments offer free or low-cost testing.
- 5BV often recurs after antibiotic treatment because the microbiome imbalance isn't fully corrected. Probiotic supplements containing Lactobacillus rhamnosus and L. reuteri strains may help maintain microbiome balance after treatment.
When to Call a Professional
A strong fishy smell combined with thin grayish discharge — see a doctor for BV diagnosis and treatment. OTC products won't address BV.
Itching, burning, or yellow-green discharge with a foul smell — possible trichomoniasis or another STI. See a doctor or sexual health clinic.
Recurrent painful lumps in the groin that break open — this describes hidradenitis suppurativa, a medical condition requiring dermatologist treatment.
A strong smell that doesn't respond to hygiene improvement and has no obvious cause — see a doctor to rule out infection, skin condition, or in rare cases, an underlying metabolic issue.
How to Prevent It
Wear cotton underwear and change daily — the single most impactful preventive measure for groin hygiene.
Keep skin folds dry — after bathing and after exercise, ensure the groin area is completely dry before dressing.
Don't douche — internal vaginal washing disrupts the natural microbiome and is a leading cause of BV. The vagina maintains its own healthy environment without internal cleaning.
Change out of wet swimwear and workout clothes promptly — extended wear of wet fabric creates ideal conditions for yeast and bacterial overgrowth.
See a doctor for recurrent infections rather than treating repeatedly with OTC products — frequent recurrence often means something else is going on that needs proper diagnosis.
Normal vs. Abnormal: Knowing the Difference
Not all genital odor is a problem. A certain amount of natural, musky, body-odor-like scent is completely normal — it reflects the natural microbiome, hormones, and sweat gland activity that are part of healthy physiology. The odor that healthy genitals produce is subtle and not typically noticeable to others in normal social situations.
Abnormal odors are those that are: significantly stronger than typical, have a specifically fishy quality (BV), yeasty/bread-like quality (Candida), or foul/putrid quality (infection or STI); are accompanied by discharge, itching, burning, or pain; appeared suddenly or changed significantly; or don't respond to normal hygiene.
One of the most important health messages around genital odor is that it's commonly undertreated because people are embarrassed to bring it up with a doctor. BV, for example, is the most common vaginal condition in women of reproductive age — far more common than yeast infections — but many women treat it repeatedly with OTC antifungals (which don't work for BV) because they don't know the difference. Getting the right diagnosis is essential for effective treatment.
Frequently Asked Questions
Yes — a mild, musky, body-odor-like smell is completely normal. The groin contains a high density of apocrine sweat glands, stays warm and covered, and has its own natural microbiome. The key is 'mild' and 'musky' — a subtle scent is normal. A strong fishy, yeasty, or foul smell that's noticeably different from baseline warrants attention.
If the smell persists immediately after showering, check: are you washing the skin folds thoroughly? Are you drying completely before dressing? Is the smell coming from the vaginal canal (which external washing doesn't address — BV requires medical treatment) or from the skin? Persistent skin odor despite good hygiene suggests a skin infection (yeast, bacteria) or a microbiome issue that needs treatment.
Trimming does reduce odor somewhat because shorter hair traps less sweat and bacteria and allows better airflow. Complete removal is a matter of personal preference — it doesn't prevent odor and can increase friction-related skin irritation that worsens odor. Regular trimming is a reasonable middle ground for those concerned about hygiene-related odor.
Yes — the same dietary factors that affect overall body odor (garlic, onions, cruciferous vegetables, alcohol, red meat) affect apocrine sweat composition, including groin sweat. Strong garlic or onion consumption produces sulfur compounds in sweat that are noticeable in the groin area specifically. Staying well-hydrated dilutes these compounds.