Due to legal reasons, neither the injured child nor his alleged attacker can be named.
But the incident happened at Carnwath Primary School on December 13 when a P6 pupil playing during a break was kicked in the face by a P7 pupil.
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The child was taken to Wishaw General Hospital to be checked for a suspected broken nose but was released after treatment for severe bruising.
The pupil allegedly responsible received a five day exclusion from school, a 'punishment' described by the victim's father as "little more than a reward of an early Christmas holiday for injuring my son".
A spokeswoman for South Lanarkshire Council said she could not comment on any aspects of the individual case.
However, she added: "Schools throughout South Lanarkshire adopt a no tolerance approach to bullying."
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For more information on this story, pick up a copy of this week's Carluke and Lanark Gazette which is in the shops now.