Fatty deposits are clusters of fat cells that can accumulate in various parts of the body. They often appear as lumps or bumps under the skin and can vary in size. These deposits can be caused by factors such as genetics, diet, and lifestyle choices. In some cases, fatty deposits may indicate underlying health issues, such as high cholesterol or obesity. While they are usually harmless, it's important to monitor any changes in size or appearance, as they can sometimes require medical evaluation or treatment.