What causes bromidrosis?

Bromidrosis, commonly known as body odor, is primarily caused by the breakdown of sweat by yeast and bacteria. When sweat is produced by the apocrine glands, it is initially odorless. However, when it comes into contact with the bacteria that naturally inhabit the skin, the bacteria metabolize the organic compounds found in sweat, resulting in the production of odorous byproducts. This process can lead to the characteristic smell associated with bromidrosis.

While other factors such as excessive oil production or blocked sweat glands may contribute to skin conditions, they do not directly cause the odor associated with bromidrosis like the action of yeast and bacteria on sweat does. Allergic reactions may cause skin irritation or inflammation but are not a primary factor in the production of body odor. Thus, the correct answer highlights the crucial role that microbial activity plays in the development of bromidrosis.