Ok I always get a shaving rash under my chin about 1 day after I have had a shave. I am using a brand new razor head and also a sensitive shaving gel. I never used to get a rash before but I can't shave anymore other wise I will get this annoying itchy rash. I have been using the same brand/type of razer for a few years same with the gel so its not the products. And I haven't changed my shaving style ether. What can I do to stop getting this annoying rash?