Which condition involves a chronic unpleasant odor emanating from the skin?

Bromhidrosis refers to a condition characterized by chronic and unpleasant odors emitted from the skin, often due to bacterial decomposition of perspiration. This condition typically occurs in areas of the body where sweat glands are abundant, such as the armpits and feet. The odor resulting from bromhidrosis can be exacerbated by factors such as diet, hygiene, and medical conditions that contribute to increased sweating or changes in skin flora.

Hyperhidrosis, on the other hand, relates to excessive sweating but does not inherently involve an odor. Anhidrosis is the inability to sweat normally, which would not cause any odor issues. Acne is primarily a skin condition influenced by clogged pores and inflammation, and while it may produce some odor when bacteria are involved, it is not defined by an unpleasant smell like bromhidrosis. Thus, bromhidrosis is the specific term for the chronic odor condition arising from the skin.