The white adherents on the underarm hairs may be the products of oil secretion, or they may be caused by diseases such as armpit hair ringworm. 1. oil secretion products: sebum has excretory effect, can help the body discharge unwanted fat-soluble metabolic wastes, if the skin oil secretion is too much, some people may appear in the armpit white adherent. 2. Axillary lichen planus: its etiology is mostly related to factors such as ciliated rod-shaped bacilli, tiny rod-shaped bacilli, excessive sweating, etc. It is mostly manifested as the emergence of nodular particles of different colors in axillary and pubic hairs, and white attachments may appear on the axillary hairs of some patients. The cause of white adherent on axillary hair is not one, and patients are advised to go to regular hospitals to find out the cause of the disease.