What sort of Crossfit workout is scheduled at your box today? Not all workouts involve barbells. If it's a gripping-something sort of workout, maybe there's an alternative one you could do (sprints, sit ups, air squats, etc.) Don't risk breaking those blisters.
But if you're in a lot of pain, I'd say take a day off and see how it feels tomorrow.
You make your choices, and you live with them. In the end, you are those choices.
"Strength is the mental and physical fortitude to endure, resilience to bounce back, and force to create change, allowing you to thrive in any circumstance and through any adversity." TrPAssassin