Why is tom afraid to scratch his nose?

Tom is afraid to scratch his nose because he worries it might draw attention to himself or make him look awkward in a social situation. He might also be concerned that scratching could irritate his skin or lead to an allergic reaction. Additionally, he could have a superstition or a past experience that makes him believe scratching will bring bad luck. Overall, his fear stems from a combination of anxiety and a desire to fit in.