Bruised Big Toenail: Causes, Running & Best Treatment! The #1 cause of a bruised big toenail is from running and tight shoes: Make sure you have the 100% best treatment and FIX IT! https://youtu.be/oqYFvfKQ4bI Bruised big toenail from running and tight shoes overview: Don’t worry there is usually no danger or and usually … Read more