My idea is to add the possibility (and need) of removing various shrapnels from our bodies. Such a wound may lead to a constants pain, serious swelling, blood loss, infection, and consequently, to our death. In order to remove a given shrapnel, character may use pliers, scalpel etc. Light source, painkillers, a flat surface and clean bandages / cotton balls should be required too. On the other hand, a careless way of removing shrapnels should lead to a fatal blood loss. So if the damage does not need healing, or if our own attempt at removing the shrapnel would cause more damage than what is there, the shrapnel should be left behind. Of course, such a wound should be quite rare
