There are a few key differences between razor burn and razor bumps. Razor burn is a general term used to describe any discomfort after shaving, while razor bumps are raised red bumps that can appear after shaving. Razor burn is usually caused by shaving too closely or with a dull razor, while razor bumps are caused by ingrown hairs. Ingrown hairs are caused by clogging the pores after shaving making more difficult for the new hair to grow out and switching to grow inwards. Shaving with a dull razor can also cause ingrown hairs, so it’s important to use a sharp blade when shaving. To prevent razor burn or bumps, it’s best to shave in the direction of hair growth and to avoid going over the same area multiple times.