Using scissors to cut nails is not proper and a nail cutter should be used for it. In your case you not only cut your nails with scissors but also use them to cut the surrounding skin. This is indeed a very unhealthy habit and should be stopped as it exposes your skin to various kinds of infections. In case the scissors are rusted then it might harm you even more. My advice to you is to stop it as it is unhealthy even If you are the only one using the scissors.