like angelbaby said, infection should be your first concern. take the pup to the vet. make sure there are no internal injuries. ruptures. tears. etc. the vet will give you antibiotics if the butcher didn't keep the ears clean.
once the pup is all healed up you can address the hair loss and scar tissue with some nustock. but not until the pup is cleared of all other issues.
~ jo and Gotti Boi (aka Thunder Thighs, aka Jughead, aka The Doo Doo Monster, aka Sexual Chocolate, aka Mister Smiley, aka Sofa King)