A small bump on a cat’s nose bridge may a swelling or scab from a wound. This may be the most common in cases of multiple cat households or in outdoor cats that end up in fights with other cats. A single bump or large swelling on the nose bridge is more concerning as the most common causes for more significant swellings are fungal infections and cancers. If you’re not sure what you’re seeing, consider sending a photo to your vet’s office for a second opinion or schedule an exam to have your vet take a look.