That's the terrifying thing.  Piercings, insulin pumps, pretty much everything that stays in the skin is subcutaneous.  Injections from your doctor are into muscle or veins, both of which are damn hardy abd heal easily. Having an external device with an artificial fistula connecting organ internals to the rest if the body, especially a digestive organ, is an accident waiting to happen.  Jostle the tube a bit too much abd hello septecemia.