What are some practical tips for getting rid of underarm odor?

Axillary osmidrosis—commonly known as “body odor” or “bromhidrosis”—is caused by the interaction of apocrine gland secretions with skin-resident bacteria, particularly *Corynebacterium* and *Staphylococcus* species. These glands become active at puberty and produce a lipid- and protein-rich secretion that, when broken down by bacterial enzymes, yields volatile short-chain fatty acids (e.g., propionic acid, isovaleric acid) and sulfur-containing compounds responsible for the characteristic pungent, musty, or sulfurous odor.

Effective management begins with targeted hygiene: daily washing with antibacterial soap (e.g., containing chlorhexidine or triclosan), thorough drying of the axillae, and wearing breathable, moisture-wicking fabrics (e.g., cotton or specialized athletic textiles). Topical aluminum-based antiperspirants—applied at night to dry skin—reduce sweat output by temporarily occluding eccrine ducts; formulations with 10–20% aluminum chloride hexahydrate are often first-line for mild-to-moderate cases.

For persistent odor despite conservative measures, clinical interventions include intradermal botulinum toxin A injections, which block acetylcholine release from sympathetic nerve endings and significantly reduce both eccrine and apocrine secretion for 4–6 months. In select patients, microwave thermolysis (e.g., miraDry®) delivers controlled thermal energy to destroy apocrine and eccrine glands in the dermis and subcutaneous tissue, offering durable reduction in both sweating and odor after one or two treatments. Surgical options—such as excision, liposuction-assisted curettage, or laser ablation—are reserved for severe, refractory cases due to risks including scarring, compensatory hyperhidrosis, and altered sensation.

It’s important to distinguish axillary osmidrosis from other conditions: generalized hyperhidrosis, trimethylaminuria (“fish odor syndrome”), or metabolic disorders like phenylketonuria or diabetic ketoacidosis—which present with systemic signs and require distinct diagnostic evaluation. A board-certified dermatologist or endocrinologist can help confirm diagnosis and tailor therapy based on severity, patient preference, and comorbidities.