[header] How to prevent a writer's bump callus [title] Assess your grip. [step] Grab the type of utensil that you normally use for writing, then get some paper. Write a few sentences, focusing on the way that the pen/pencil feels in your hand. 
Think about how much pressure that you're putting on your finger and the callus itself. Then, look at the fingers that you use to hold and stabilize the pencil, noting where your callus and the pencil meet.