Boys sweaty arm hair can be removed by razor scraping, depilatory cream removal or laser hair removal and so on. 1. For large areas of sweat hair, you can choose to shave the razor, usually first coated with aloe vera gel and other lubrication of the arm to prevent cuts, you can shave the arm excess sweat hair, but easy to shave not clean and short-term regrowth, rough to the touch. 2. The safer way to remove hair is to apply hair removal cream locally and wipe off the cream after a few minutes, which can remove the sweaty hair on the surface of the skin, but the disadvantage is that you need to remove the hair again after a period of time. 3. Laser hair removal is through the photothermal dynamics of the hair follicle structure to destroy, thereby inhibiting hair growth, so as to achieve the effect of hair removal once and for all, safe and long-lasting; but the laser is only on the growing hair follicles have a role to play, and generally need more than one treatment in order to achieve the desired results. It is recommended to go to a regular medical institution for hair removal to avoid adverse reactions.