
An injury on a yukkuri's skin.
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.