Feel free to roll your invulnurable save to negate the hit!  XD<br/><br/>If you did take the damage, it's correct that you can only restore 1 point of damage to yourself.  I'm going to rule that your armor got penetrated and your arm sustained second degree burns over most of its length.  You won't feel it yet, but when you do, the shock might kill you if you're not heavily dosed with morpho.  All the medkit could really do is give you a painkiller and guide you in removing the armored plates over your arm, so that the proper ointments can be applied.  It'll be a good couple of weeks before you're reocovered from the wound, though you won't have a scar if you're careful with it.  Had you not been wearing such heavy armor, the injury would have been considerably more permanent.