It seems it is just the lot of young boys to scar themselves up while playing. Some boys would go running to Momma for comfort and first aid, others would bear their bloody injuries as honor badges among their friends. It would be all the better if the injury required a few stitches!
In Heaven, all these scars -- in fact all bodily imperfections -- will be gone. Our glorified bodies will be perfect. The scars of the wounds of this life will be only shadows of memories so vague that they can't be recalled to life.
There will be one Man in Heaven however who will still bear the scars on His face. The scars of the thorns which pierced the face of the Lord Jesus will forever remind us of His great love and sacrifice for us. Imagine looking into that glorious face and seeing the faint reminders of His great suffering for us. Imagine looking at His hand and forever knowing it was pierced for us that we might know eternal joy and peace. Imagine looking at His feet and knowing that it was wounded for our transgressions that we might walk the path of eternal righteousness and holiness.
Forever won't be long enough to give thanks.
"O give thanks unto the LORD;
for He is good: for His mercy endureth for ever."