An injury on a yukkuri's skin which causes it to appear darkened
But, you may be wondering, how do yukkuris get bruises, if bruises are caused by ruptured blood vessels that yukkuris do not have?
Dr. Eirin is here with a theory: damage to the skin thins it, thereby decreasing the opacity - and because most yukkuris have a bean-paste filling, the area of damage looks darker than normal skin - like a bruise.
That doesn't explain how stuff like Patchoulis who have white cream filling get bruises though
