Marching Band and a Busted Lip :(

A few days ago (saturday) I woke up to a busted lip. Monday to today I have marching band. Today I have to pass off a section of music. I play clairinet and my lip is no longer swolen but its still raw. What do I do? Should I try to play anyway and risk cjtting my lip back open in the process (this includes practicing beforehand)? Or should I ask my band director if I can pass it off next week Tuesday (our next meet)? Or something else? Any suggestion will help.