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Yes, this is something to be concerned about. Visit a physician for an examination. Also try to keep your nose safe from punches, by wearing what ever face gears are available. These blows can cause damage in many ways, nose lies in front of the base of brain, also punches can deviate your nasal septum
. Any injury
will cause pain at the site, be it nose or knee, pain indicates some damage, and ignoring it is not a good idea.