Cheri's right on. This looks like one trying to escape. You may need to add live plants. Usually those plastic ones are cause for damage to all frogs. You should cover sides of the cage with cloth or construction paper. It might be a wild caught animal and they won't give up trying to get out. The paper will show him the boundries and hill will stop searching for a hole in the glass. Leave these on until skin has healed, remove one at a time, days appart. If any of these scrapes get red looking(open sore) you can use original neosporin to stop infection.