How do you get rid of the dots on my skin after shaving?

I realised that I have these red dots ages ago when i first shaved obviously I shaved wrong, it was like lumpy red dots. After a while or months a didn't shaved and now it's turn brown or it looks likw chicken skin when you pluck the feathers out. I don't know how tio explain it but how do you get rid of it?. I look at other people legs and they don't have spots on their skin, their legs are like arm their arm nice and smooth nopt dorts and all that etc. Oh and it seems that the brown dots appear where the hair growing too! Please help me!. Thanks :)