This is an interesting question and comes hot on the heels of one answered earlier today about whether a certain type of ear piercing could have an effect on migraines as a form of acupuncture. The answer to this question was 'not really', and at first glance we would have to say that the same sort of overall logic applies in your case - there are unlikely to be unwanted acupuncture-type treatments caused by the insertion of hypodermic needles. Insofar as this is extremely unlikely to happen we wouldn't really consider it necessary to isolate 'safe areas' for someone.
Indeed, one of the main problems which bedevils attempts to test whether acupuncture works by the use of what is called 'sham' acupuncture points, i.e. places not recognised in classical texts, is that from an energetic point of view there aren't lines of points traversing a kind of inert space. What you really have are places where the energy is very lively and contactable, the points, and areas where the energy is not quite so active. This means that a needle off piste, as it were, is still going to have an effect. In that sense it means that there is no neutral place to stick a hypodermic.There is a great deal more that we could say about intention and technique - it isn't just a matter of finding a specific place and putting a needle in - but the bottom line is that we would have serious doubts that you could be self-treating by accident in giving yourself injections. However, if you wanted to play very safe there are innumerable charts of acupuncture points on the internet showing the flows of the four main channels through the abdomen. It should be fairly straightforward to identify area where the energy is less focused. If it feels more reassuring to inject here, then we can see no harm in so doing.