What is the term for foul-smelling perspiration, particularly in the armpits or on the feet?

The term that describes foul-smelling perspiration, especially in areas such as the armpits and feet, is bromhidrosis. This condition results from the interaction between sweat and bacteria on the skin, leading to an unpleasant odor. Unlike other types of perspiration that may not carry a strong scent, bromhidrosis specifically refers to the odor associated with sweating when it becomes bacterial in nature.

Hyperhidrosis refers to excessive sweating, but it does not specifically account for the odor produced. Dermatitis is a term used to describe inflammation of the skin, which can arise from various causes but is not associated with the odor of perspiration. Chafing involves skin irritation due to friction and does not pertain to sweat odor. Hence, bromhidrosis is the most accurate term to define the condition of foul-smelling perspiration.