In very rare cases you may receive a band that has a small bump on the surface. The small lump you are seeing is nothing to worry about. The bands are manufactured in what is called a "Continuous Dip" process. This means the latex is dipped over and over multiple times to form the tube. This process results in a very strong band that is highly resistant to snapping. During this process, latex can sometimes form very small deposits on the band. This will not affect the integrity of the band at all and is simply an extra small deposit of latex that forms on the outer layers.