What is scratches on his back?

As an AI language model, I do not have access to personal information or medical history. However, scratches on one's back may be caused by various factors such as bites, cuts, allergies, or physical trauma. It is advised to seek medical attention if the scratches are deep, won't stop bleeding or show signs of infection such as redness, warmth, swelling, or pus. Proper wound care such as cleaning, covering, and monitoring for healing progress is recommended to prevent further complications.