The white adherence on the top of the armpit hair may be the secretion of the armpit, or it may be considered to be related to armpit hair ringworm and lice disease. 1. Armpit secretion: the sebaceous glands in the armpits secrete more exuberantly, and the local secretion or shed keratinocytes adhere to the armpit hairs, resulting in the appearance of some white material on the armpit hairs. It is recommended to pay attention to personal hygiene and timely cleaning after sweating, which can help to improve. 2. Axillary tinea pedis: axillary tinea pedis is a superficial infection of axillary hair caused by ciliated rod-shaped bacillus, mainly manifested as yellow, black or red nodular particles appearing on the axillary hair shaft. It is recommended to keep the local clean and dry, remove the armpit hair, and give erythromycin, fusidic acid and other drugs to be applied locally if necessary. 3. Lice disease: an infectious skin disease caused by lice parasitizing the human body. Lice eggs are attached to the armpit hairs, resulting in the appearance of white dots on the armpit hairs. There are white attachments on top of the armpit hair, it is recommended to pay attention to personal hygiene, if necessary, to the hospital dermatology examination, a clear diagnosis and follow the doctor’s instructions for treatment.