If you are embarrassed by your underarm being black, then know what reasons they are black.
Hair removal cream: If you use hair removal cream, stop it today because even the underarms are black.
Razor: Do not use a razor on underarms at all, this makes the skin black.
Sweat: Sweating is the biggest reason for underarm darkening, so do not sweat this place.
Deo: If you use Deo, the skin of the underarm may become black.