Most of the stinging pain after shaving armpit hair is caused by skin damage, friction skin or localized folliculitis, which can be treated according to the cause of the disease, usually including general treatment and medication and other methods. 1. Skin damage: shaving armpit hair may cause damage to the skin, resulting in some small wounds, in the case of high temperature, sweat will stimulate these small wounds, thus causing pain, it is recommended to do a good job of protecting the skin, you can use medication, such as erythromycin ointment and so on. 2. Friction injuries to the skin: after shaving the armpit hair will grow out, and just grow out of the stubble is relatively hard, walking arm shaking easy to cause friction injuries, the skin has a painful feeling, you can use alcohol or iodine vodka to disinfect. 3. Folliculitis: after shaving the armpit hair local irritation or injury, may cause the hair follicle by bacterial or fungal infection, causing local skin redness, swelling and pain, it is recommended to pay attention to keep the skin clean and fresh, antibiotic ointment can be used for treatment, such as gentamycin ointment, metronidazole gel and so on. When shaving armpit hair, you should pay attention to the gentle action to avoid causing skin damage. If the above situation occurs, it is recommended to go to the hospital for consultation and treatment, after clarifying the cause of the symptomatic treatment, the drug should be used in accordance with medical advice.