White adherence on armpit hair is usually considered as tinea cruris, which should be shaved first and then ointment should be applied, and if accompanied by itching, oral medication should be added to get rid of it. Most of the white adherents on the armpit hair are tinea cruris, which is mainly caused by bacterial infection, so it should be treated with antibiotics, first shaving the armpit hair, and then applying ointment, such as fusidic acid cream, clindamycin gel, etc. If accompanied by itching and other symptoms, it is necessary to take some oral antihistamines, such as loratadine. It is worth noting that the armpit of patients with axillary lichen planus should ensure cleanliness and hygiene to prevent re-infection. If the patient’s symptoms are not relieved, or when accompanied by other symptoms, he should go to the hospital in time. Drugs need to be used in accordance with medical advice.