I think people are talking about 2 different things:
Site injection, meaning the site in which you inject into. This should be alternated in order to maintain fresh receptors and prevent abscess growth. In order to keep receptors fresh you should take a week off before injecting into the same site. You likely won't have abcess problems unless you are injecting EOD for long periods of time to the same site.
Localize site growth, meaning that where you inject grows more than the rest of your body. Some people swear that IGF-1 will cause localized growth, other say its a myth, I personally don't notice any localized growth, but I always inject it bilatterally just incase. GH can also cause localized fat loss, this is not refuted.