The burning sensation in the armpit may be caused by repeated friction of local skin, folliculitis, eczema, lymphadenitis and other factors. 1. Repeated friction of local skin: If the patient has more fat under the armpits and wears uncomfortable clothes for a long time, the skin of the armpits may be repeatedly friction, which may lead to a hot burning sensation in the armpits. 2. Folliculitis: folliculitis is usually caused by bacterial infection of the entire hair follicle triggered by purulent inflammation, under the stimulation of inflammation, there may be hot burning sensation in the armpit phenomenon. 3. Eczema: If the patient wears clothes with poor ventilation, resulting in the skin in a state of long-term moisture, it may cause eczema phenomenon, resulting in hot burning sensation in the armpit symptoms. 4. Lymphadenitis: axillary lymphadenitis is usually caused by pathogenic bacterial infection of lymph nodes inflammation, mainly manifested as lymph node enlargement, pain, fever, etc., so the armpit hot pain may also be caused by lymphadenitis. When the patient feels a hot burning sensation in the armpit, it is recommended to consult a doctor in time to identify the cause of the disease and then give targeted treatment.