1. Body odor, also known as armpit odor, odorous sweating, etc., is sweat secreted by the apocrine glands (also called apocrine glands) in the patient's armpits, vulva, mouth and other parts of the body. The fatty acid content is higher than that of ordinary people. It is light yellow and thick; when the fatty acid reaches a certain concentration, it is decomposed by bacteria on the skin surface, mainly Staphylococcus aureus, to produce unsaturated fatty acids and emit a smell. It is similar to the odor expelled from the anus of foxes, so it is often called body odor.
2. Apocrine sweat gland dyshidrosis: Apocrine sweat glands only exist in the axilla, areola, umbilical fossa, anus, vulva and external auditory canal. In addition to the axilla, the function of this gland is in other parts Very weak and produces very little sweat. The sweat secreted by apocrine sweat glands is initially sterile. Under the action of microorganisms, the organic matter in the sweat is decomposed to form short-chain fatty acids and ammonia with a special odor, leading to the occurrence of apocrine sweating syndrome.
3. Eccrine dyshidrosis: often occurs in the palms, soles and intertriginous areas. The small sweat is often colorless and odorless. However, in the case of excessive sweating, the sweat is decomposed by parasitic bacteria on the skin surface to release fatty acids. This will produce a special odor; other substances such as garlic and arsenic can be excreted through the eccrine glands to cause odor.
4. Odorhidrosis can also occur when the mental or nervous system is damaged (such as paranoia, schizophrenia, etc.).
5. The occurrence of armpit odor may be related to genetics.