Bromhidrosis, also known as osmidrosis and ozochrotia, is a condition of malodorous sweat that occurs due to changes in either apocrine or eccrine sweat.

Apocrine bromhidrosis is the more common subtype. It typically affects the axillae and occurs when apocrine sweat is metabolized by anerobic diphtheroids and other skin flora to form ammonia and short-chain fatty acids.

Eccrine bromhidrosis usually affects the feet but may also affect the inguinal area and other intertriginous areas. It is often associated with hyperhidrosis that leads to a macerated stratum corneum, which then undergoes bacterial degradation. It can be exacerbated by a lack of hygiene or conditions such as diabetes (Type 1, Type 2), obesity, intertrigo, and erythrasma.

Bromhidrosis is most common in men and shows no predilection for race / ethnicity. Apocrine bromhidrosis occurs after puberty. Eccrine gland bromhidrosis can occur at any age.