"Is all underarm odor caused by body odor (B.O. or狐臭)?"

Axillary Odor: Causes and Treatments

Axillary odor is not necessarily due to狐臭 (body odor), but can also stem from non-pathological factors such as excessive sweating and inadequate cleaning. However, it can also be caused by diseases like trichomycosis axillaris, hyperhidrosis, or overactive apocrine sweat glands.

In case of discomforting symptoms, it is advisable to seek medical attention promptly.

Non-Pathological Factors:

1. Excessive Sweating: Hot weather or vigorous exercise may lead to profuse sweating in the axillary region, resulting in odor. Typically, no special treatment is required; maintaining personal hygiene is sufficient.
2. Inadequate Cleaning: Neglecting personal hygiene, prolonged periods without bathing, or not changing clothes can foster bacterial growth in the axillary area, causing odor. Regular bathing and maintaining the axillary region dry and clean is recommended.

Pathological Factors:

1. Trichomycosis Axillaris: A skin condition caused by infection with Corynebacterium tenuis, manifesting as yellow, black, or red nodules on axillary hair, accompanied by itching and odor. Treatment options include topical application of erythromycin ointment or mupirocin ointment under medical guidance.
2. Hyperhidrosis: May be genetic or triggered by stress. It involves abnormal, excessive sweating throughout the body or in localized areas, including the axilla. Treatment can involve medications like oxymetazoline bromide tablets or oryzanol tablets prescribed by a doctor.
3. Overactive Apocrine Sweat Glands: If the apocrine sweat glands are hyperactive, excessive sweat accumulates in the axilla, leading to odor. Topical application of aluminum chloride hexahydrate solution (e.g., Urotropine solution) may be prescribed.

Additionally, a sebaceous cyst with infection can also present similar symptoms. Patients are advised to promptly consult a physician for diagnosis and targeted treatment.