Razor bumps, also known as pseudofolliculitis barbae, occur when hair grows back into the skin after shaving. This can lead to inflammation, redness, and small, painful bumps. They are most common in areas where hair is coarse and curly, such as the face and neck. These bumps can be prevented by using proper shaving techniques, such as shaving in the direction of hair growth and using a sharp razor. Additionally, moisturizing the skin before and after shaving can help reduce irritation and the likelihood of developing razor bumps.