Bromhidrosis
Body odor, or underarm odor (medically known as bromhidrosis or osmidrosis), is sweat that carries a strong, unpleasant smell well beyond what is normal for the body. It is not physically dangerous, but it can take a heavy toll on a person's emotional well-being, confidence, and social life.
Freshly secreted sweat is essentially colorless and odorless. Odor develops only when sweat components react with the bacteria that normally live on the skin (especially gram-positive species such as Corynebacterium and Staphylococcus). Depending on which sweat glands are involved, there are two main types:
- Apocrine bromhidrosis: The most common and most troublesome type, centered mainly on the armpits and the genital and anal area. Apocrine glands become active at puberty and release sweat rich in lipids, proteins, and steroids. Skin bacteria break down these odorless precursors into volatile free fatty acids (such as 3-methyl-2-hexenoic acid) and thioalcohols, producing the sharp, pungent, sour smell typical of underarm odor.
- Eccrine bromhidrosis: Less common, involving the ordinary sweat glands found all over the body. Odor arises when eccrine sweat softens the outer skin layer (maceration), letting bacteria break down keratin (usually on the soles of the feet), or when odorous substances are excreted after eating certain foods (garlic, onion, alcohol), taking certain drugs, or because of a systemic metabolic disorder.
At Haute-Derma, treating bromhidrosis is about more than simply reducing sweat. We take a multi-layered approach: shutting down apocrine secretion at its source, controlling odor-causing bacteria, and restoring a healthy balance to the underarm skin microbiome.
Clinical Features and Differential Diagnosis
Examining a patient with body odor means looking at where it occurs, what the secretions are like, and what factors make it worse:
- Typical locations: The apocrine type mainly affects the armpits (axillary bromhidrosis), groin folds, and the area around the anus. The eccrine type usually affects the soles of the feet (plantar bromhidrosis) or is widespread.
- Yellow underarm stains and secretions: Apocrine sweat is slightly sticky; mixed with bacteria and antiperspirant, it can leave stiff yellow or light brown stains on the underarms of clothing.
- Genetic link (ABCC11): Underarm odor is closely tied to variants of the ABCC11 gene. People with the genotype for wet earwax tend to have considerably more numerous and more active apocrine glands than people with dry earwax.
- Triggers: The condition starts at puberty under the influence of androgens and flares with exercise, hot and humid weather, or emotional stress (which activates the sympathetic nervous system).
- Psychological and social impact: Patients often feel anxious and self-conscious, withdraw socially, or wash and scrub excessively, which can lead to secondary contact dermatitis.
Haute-Derma's Approach to Diagnosis and Treatment
- Medical classification and severity assessment: The doctor examines you, determines which type of sweat gland is involved (apocrine or eccrine), and checks the state of the skin's bacteria and how much you sweat. A careful assessment helps distinguish primary underarm odor from odor caused by metabolic or systemic disease.
- Controlling skin bacteria and reducing local sweating: We show you a medical skin-cleansing routine using gentle antibacterial washes to keep Corynebacterium in check, and prescribe an aluminum chloride antiperspirant at a suitable strength to cut down the sweat that bacteria feed on.
- Advanced technology and specialist procedures: We build a personalized plan using modern options such as botulinum toxin (Botox) injections to block sweat secretion, or microwave and medical laser technology to selectively destroy the apocrine glands in the armpit while minimizing damage to surrounding tissue, for long-lasting odor control.
- Skin barrier repair and lifestyle advice: We advise gentle underarm skin care with non-occlusive, barrier-repairing moisturizers to avoid irritation. Your doctor will also suggest dietary changes (less strong-smelling food, spices, and alcohol) and breathable clothing to help keep results lasting.
Common Types of Body Odor
| Type / Classification | Mechanism and Clinical Features |
|---|---|
| Apocrine bromhidrosis | Affects the armpits and groin from puberty. Bacteria break down lipids and proteins secreted by apocrine glands into free fatty acids and thioalcohols, producing the typical pungent smell. |
| Eccrine bromhidrosis | Affects the feet or the whole body when eccrine sweat softens the outer skin layer and lets bacteria break down keratin, or when substances from food (onion, garlic) or drugs are excreted in sweat. |
| Metabolic (systemic) body odor | Very rare. Caused by a missing enzyme needed to break down certain compounds (for example, fish odor syndrome, or trimethylaminuria), so the odor is released through sweat and breath. |
