If the odor under the arm is caused by uncleanliness, attention should be paid to cleanliness; if it is caused by armpit odor, medication and surgical treatment can be carried out. 1. If there is odor under the arm, it can be caused by sweaty armpits and not cleaned in time, so you should pay attention to maintaining good hygiene habits. 2. Odor under the arm can be caused by armpit odor. (1) when the symptoms are mild, you can use some antiperspirant bactericidal aromatics to relieve, such as aluminum chloride solution, 1% povidone iodine solution. (2) When the symptoms of bad odor are serious, you can choose local injection of drugs (botulinum toxin type A, tretinoin, etc.) for treatment, or you can choose the gold micro-needle radiofrequency or surgical treatment, to destroy the sweat glands in the armpit, to solve the problem fundamentally. If the phenomenon of odor under the arm is serious, you should go to the hospital in time to consult the examination, the use of the above drugs should pay attention to follow the doctor’s instructions.