You have little bumps on your armpit but why and how do you get rid of it?

Are you pushing when you shave your arm pits? When I did that I got bumps too. Now I glide over my under arms with a razor and use a good shaving creme or other product. Shaving creme dulls your razor quickly and I find that hair conditioner or coconuts oil makes a great supplement. Hope I help you. ;)