Underarm hair in girls is usually treated with laser in the clinic. For women with hairy underarms, the laser can be used to destroy the hair follicles through the principle of selective photothermodynamics, so that the number of hair follicles will become fewer and the speed of hair growth will decrease, thus achieving the purpose of permanent hair removal. Laser hair removal treatment usually requires at least 4-5 sessions. After several hair removal treatments, the newly grown hairs are obviously finer and lighter in color. However, laser hair removal also carries risks of burns, hyperpigmentation, purpura, and the possibility of hairs growing back. If girls have underarm hair, it is recommended that they go to the hospital in time and follow the doctor’s instructions for treatment.