What skin condition is characterized by foul smelling perspiration?

Bromhidrosis is the condition characterized by foul smelling perspiration. This occurs due to the interaction of sweat with bacteria on the skin, which breaks down the sweat and produces unpleasant odors. In particular, apocrine sweat glands, found in areas such as the armpits and groin, become active during puberty and are primarily responsible for this type of sweat. When the sweat is not evaporated or removed properly, bacteria can flourish, leading to the resulting odor associated with bromhidrosis.

Hyperhidrosis refers to excessive sweating but does not inherently include odor. Dermatitis and psoriasis are both skin conditions characterized by inflammation and scaling, respectively, but they are not directly related to the smell of perspiration. Thus, bromhidrosis specifically addresses the issue of odor in perspiration, making it the correct response.