The black spots at the root of the armpit hair are considered to be the part of the hair left after hair removal and inside the skin, which can be removed by waxing paper and laser treatment. 1. Waxing paper: Waxing paper can uproot the remaining hair in the armpits, but this method is more painful and may cause itching and tingling sensation, so it is recommended to stop using it if discomfort occurs. 2. Laser treatment: Laser treatment utilizes the photothermal principle of laser, which selectively acts on melanocytes and heats them up, thus destroying the hair follicles and making the hairs fall off, so as to achieve the purpose of removing black spots. For the black spots at the root of the armpit hair, it is recommended that patients go to regular hospitals to get a clear diagnosis and standardized treatment under the guidance of professional doctors.