The American Academy of Pediatrics states that a definition of significant trauma is any injury beyond temporary redness of the skin. One practical criterion often used is that any inflicted injury that lasts more than 24 hours constitutes significant injury (ie, physical abuse).
Cord slap mark
Bruises and abrasions which are not consistent with common childhood accidents and found in atypical areas such as buttocks, hands, or trunk in mobile children and any bruising in nonmobile children should arouse suspicion.
Burns with unusual patterns should also arouse suspicion. The most common form of abusive burns is from tap water. Dunking injuries are marked by having distinct borders.