Why does my skin itch every where on earth that I shave?

I never had this problem up to that time, until I got into some poison ivy a few months ago. The singular place affected by the ivy be under my chin, where on earth I scratched on accident, but these other places own since begun to itch over the closing month or so. The poison ivy has long since cleared up, all the same the itch continues.Why does my skin itch every where on earth that I shave?
try putting some lotion after u shave it will help
I don`t know is the shaving cream u use. the other times u sed to shave did u get itchy? i have an idea that the shaving cream is allergic to your skin