Are white deposits on underarm hair a sign of body odor (bromhidrosis)?

Generally speaking, white deposits on underarm hair are not necessarily indicative of bromhidrosis (body odor). They are often sweat crystals or bacterial secretions. If a strong odor accompanies these deposits, however, they may be related to bromhidrosis. If concerned, it is recommended to seek medical advice in advance. Detailed analysis is as follows:

White deposits on underarm hair commonly form due to crystallization of salts and fatty acids in sweat after evaporation, or secretions produced by bacterial breakdown of sweat that adhere to the hair. These deposits are usually white or light yellow, lack a pungent smell, can be washed away with warm water and soap, and do not leave a persistent odor afterward. They may reappear only after heavy sweating and are not directly associated with bromhidrosis.

If the white deposits are accompanied by a noticeable pungent odor, quickly reappear after cleaning, and emit a stronger smell during physical activity or in hot, humid conditions, they may be related to bromhidrosis. Patients with bromhidrosis have apocrine sweat glands that secrete sweat containing higher levels of fatty acids, which are easily broken down by bacteria to produce odor. These secretions mixed with sweat can also form white deposits, which may feel slightly sticky and are somewhat harder to clean.

Daily care should focus on keeping the underarm area dry, changing breathable clothing regularly, and cleaning underarm hair to remove deposits. If odor significantly affects your daily life, you should promptly visit a reputable medical facility for diagnosis. Avoid self-diagnosis and inappropriate treatments that may delay effective intervention.