You could wipe it down with a damp cloth to get the grit off and then let it dry. You don't want to scratch your edge with that. If you don't feel anything sticking up then your good to go. The only other thing I could think of is burnishing the nick. (smoothing it down by rubbing a bottle or something smooth over it.) Pics would help the experts if/when they come in. If they don't take it to the strop section and knock on somebodies door :<0)

I have had a lot of leather but there are strop makers hanging around in here that may have specific advice for you.