Sweating pain and redness in the armpits may be caused by intertriginous rash, folliculitis, contact dermatitis and other diseases, which need to be used externally for the cause of the disease, such as glycerin lotion, mupirocin ointment, tretinoin and other ointments. 1. Intercalated eruption: patients can apply glycerin lotion externally on the armpits, which can relieve pain and redness, keep dry and reduce sweating. Meanwhile, topical glucocorticosteroids, such as trimethoprim and dexamethasone, can also be used under doctor’s supervision. 2. Folliculitis: usually caused by bacterial infection, sweat stimulation can cause local pain, need to use mupirocin, fusidic acid and other antibiotic ointment as prescribed by the doctor. 3. contact dermatitis: armpit contact allergens or irritants can also cause local redness, swelling, pain, patients need to follow the medical advice of local use of hydrocortisone, mometasone furoate and other glucocorticoid ointment. It is recommended that patients with underarm sweating pain and redness go to the hospital, cooperate with the doctor to actively treat, drugs need to be used under the guidance of a doctor, do not self-medication.