White crystals on the hairs of the armpits are considered to be caused by armpit hair ringworm, and the removal methods include general methods, drug interventions, etc., which need to be analyzed specifically. 1. General method: first of all, you need to remove the surrounding affected armpit hair, at the same time, pay attention to hygiene, wash the armpit every day, keep dry. 2. Pharmacological intervention: mainly take antibacterial drugs, such as 5% benzoyl peroxide, 2% erythromycin, 1% clindamycin, etc. It should be noted that the three kinds of drugs will cause some stimulation to the local skin, such as burning sensation, rash, etc., and should be avoided to contact with the mouth, nose, and eyes, in order to avoid adverse consequences. If the patient’s armpit sweats more, you can also use antiperspirant for treatment, such as 1% formalin solution. All of the above drugs need to be used under the guidance of a professional doctor, if the patient has symptoms of white crystals on the hair of the armpits, it is recommended to seek medical attention in a timely manner, under the examination of a professional doctor to confirm the cause of the disease, targeted treatment.