Lice in the armpits may be related to poor hygiene habits, and may also be caused by other factors such as pubic lice infection and contact with patients infected with lice. 1. Bad hygiene habits: do not pay attention to personal hygiene, long-term not bathing, it is easy to provide a growth environment for lice, so that lice parasites in the underarm hair. It is recommended to maintain personal hygiene, shave the armpit hair, and do a good job of underarm cleaning. 2.Other factors (1) Pubic lice infection: mostly parasitized in the perineum part of the root of the pubic hair, can be transmitted to the armpit, causing lice in the armpit, can be accompanied by vulvar itching, local skin rash and other symptoms. (2) contact with patients infected with lice: lice are mostly transmitted by contact, if the armpits are in contact with patients with lice, they may be infected, causing lice in the armpits. It is recommended to consult a doctor in time to find out the cause of lice in the armpits, develop good hygiene habits, and actively treat the disease to avoid delays.