It is never okay to strike a child hard enough to leave bruises, welts, or cut skin. Leaving marks on a child can be considered child abuse, even if the marks were unintended. Just because it is on the buttocks only does not make it right to do. Perhaps think about using Time outs or take away toys, rather than hitting your child.
Child Abuse laws differ from jurisdiction to jurisdiction; however, I find it very unlikely that there's any statute that specifically states, "leave bruises on your child for more than 24 hours". Most statutes state something similar to "The child is free from cruel and unusual punishment from the parent or guardian". Generally, if you're leaving serious bruises, the child probably IS being subjected to cruel and unusual punishment.
not usually
yeah
buttocks!
it leaves bruises
Yes- you could beat someone up and leave them hurt, but bruises may not be visible.
perhaps plantat fascitis
Edward accidently gave her the bruises while they made love for the first time on their honeymoon at Esme's Island.
I told you they're birthmarks. Leave me alone.
No kids should not be allowed to divorce parents
If you can't discern shapes, the world will impact you quite a lot and leave bruises.
Before Curley's wife leaves, what does she notice about Lennie?