Burning pain in the underarm skin is considered to be caused by folliculitis, lymphadenitis, herpes zoster and other diseases. 1. Folliculitis: this disease is a common clinical inflammatory skin disease, mainly due to clothing friction, sweat stimulation, bacterial infection and other factors, often leading to local itching, pain and other symptoms, and accompanied by localized red papules. 2. Lymphadenitis: this disease is one of the more common benign clinical lymph node lesions, usually due to the presence of bacterial, viral and other pathogens in the patient’s body, the pathogens enter the lymph nodes with the lymphatic vessels. If the patient has recently existed axillary lymphadenitis, there may be symptoms such as axillary lymph node enlargement, pain, and skin fever, which may manifest as burning pain in the axillary skin. 3. Herpes zoster: this disease is due to herpes zoster virus infection, often leading to local skin lesions such as pimples, blisters, etc., which can occur in any part of the body, and the skin lesions are usually accompanied by burning sensation and other abnormal sensations. If herpes zoster occurs in the armpits, the symptoms of burning pain in the armpits will occur. There are many clinical reasons for the burning pain in the armpits, so it is recommended that the patient consult a doctor to determine the cause of the disease and treat the symptoms under the guidance of the doctor.