as all Dysons have "Dyson's Gift" there are certain biological factors that simply cannot happen naturally to them. they cannot scar, get drunk (or even get the tiniest of 'buzz' from alcohol) be affected by drugs or any kind of chemical stimulant or depressant. birth defects and natural disease do not exist and even should you tear off one of their limbs, it will grow back, the speed depends on the skills of the Dyson in question. this does not mean their society is perfect, because Dyson style counterparts are FAR worse to the unprepared and EVERY single one is purposefully made to cause harm, leading to the popular saying "Dysons have no excuses! Everything we do is our responsibility."

the mark on Shesheiks back is more of a 'temporary' tattoo. a reminder for the first major loss she suffered and no it was not against Mar.