2 days ago i missed a step on stairs and slipped. my shin hit into a step and i figured i just got a bruise. i went home and noticed no physical difference, but it was numb and hurt upon pressure around the numb area. what happened and can i fix?

It is most likely that you sustained a blunt force trauma to one of the superficial cutaneous nerves in the shin. This could be further compounded by compression from bruising. While it is unlikely that there will end up being any functional residual limitations from such an injury, a numb skin patch is annoying and sensitive. I would recommend having your physician evaluate and ice.