Nine-year-olds with armpit odor can be treated with medication, surgery and laser therapy. 1. Medication: Botulinum toxin type A or polycitric acid can be injected into the armpits to improve the phenomenon of excessive secretion of sweat in the armpits, so as to reduce the odor of armpits. 2.. Physical therapy:Through the semiconductor laser, micro-needle radio frequency, carbon dioxide laser and other physical ways to destroy sweat glands, reduce sweat breeding, in order to reduce armpit odor. 3. Surgical treatment: Surgical treatment is the most thorough way to treat armpit odor, and the surgical methods include negative pressure suction surgery, small incision minimally invasive sweat gland clipping surgery, and axillary skin shuttle total excision, which can be chosen according to the needs. Children with armpit odor, it is recommended to pay attention to personal hygiene, keep mood relaxed, go to the hospital to choose the appropriate treatment.